Product: Credit reporting, credit repair services, or other personal consumer reports

Hello, I have a Barclaycard Credit card. I have had this card since XXXX and have always made my payments. My monthly payment is usually only about $ XXXX however I always pay several times more than the minimum amount for example 2, 3, or {$400.00} or more. 
Around XXXX of XXXX I went on line to make my scheduled monthly payment and noticed in my payment history section of their website were it listed all my prior payments it stated " You have no scheduled payment at this time ''. 
I was surprised to see this as I never noticed it before, but assumed it was just that, I had just never noticed it, and it was stated due to my always paying many times over what the monthly payment due for the prior month was so therefor I was covered on a number of many or at least as it stated that months due payment. Because the holidays had just past I thought well, that's great, I think I will take advantage of it that month and pay a bit more to a debt with a higher balance. Despite becoming a customer in XXXX and it having been in XXXX a customer for over 4 years my credit limit was only {$700.00}. This is the limit I was given when I received the card and it had never increased in 4 years, despite my excellent history with them. 
It wouldn't be till many months later I would see that they had reported a past 30 days late payment reported to the credit bureaus dropping my credit score by over XXXX points! 
I have documents I will attach of the letter received, photos of the section on their website that if you look at the date is the XXXX of the month ( I used XXXX as example ) you will see were it states, " no payment due '' yet on their other payment page it has the actual amount and date which if you look is the same date XX/XX/XXXX stating a payment due no later than that day. 
This is a problem that needs to be corrected and I will assume it is not intentional and will be corrected as well. 
I have been trying to correct this since. 
I called several times, spoke with many customer service reps who stated it was an error and they would be correcting it on my credit reports by the next reporting cycle. 
This still has not been corrected, despite further multiple calls, continued disputes with Barclay and with each individual major credit bureaus.

Barclaycard also at the time they made their incorrect report lowered my available credit line to {$500.00}. I am disgusted with the way this credit card has treated me especially as I am an excellent customer. 
By Barclay not rewarding periodic increases in my available credit as deserved it is most likely reflected as a negative on my report. Due to being an excellent customer my credit limit should reflect this regardless of whether i use the available credit or not. Due to Barclaycard leaving my available balance at such a low level if I use the card it will always reflect my usage level, which we know effects our scores, even if charging only {$250.00} or more as being over 50 % usage! I find this to be very unfair & a deceptive practice. When I initially applied for this card it did not say anything about them not rising available credit with the proper and responsible use of their credit card, in fact I applied for their card only after recieving an offer to transfer balances from other cards I may of had which had higher APR than they did and this was the reason I applied.

After writing down the balances I wanted transferred in my application I expected this to be what I received but it was not, I did not received a card able to handle any balance transfer but this card i speak of with this minimum available limit of only {$700.00} and now down to {$500.00} for the error they made, how quickly and eager they were to lower this.

After calling Barclaycard again I finally received a written letter via postal mail were Barclay card has again but now in writing has agreed to correct this error and again I do not see this correction reflected on any of the three credit bureaus.

I also am calling for the increase of my credit score by at least the XXXX points that were subtracted from it when this error was reported. This is very very important!! As I am sure Barclay will agree, what is the point of corrected this error if they do not correct the reaction to the report of a fall in my score that occurred after they made this wrong report.

I also would like my available to credit limit effected at the time to be corrected and if they would care to show good business faith maybe this is the time they could give a increase that one would deserve who has been such an outstanding responsible customer. 
I think this is not much to ask for and after the time spent and trouble caused by this mistake it is the least they could do and would rectify this issue greatly, and I deserve it. 

Respectfully, XXXX XXXX