Product: Debt collection

My Dispute is with Meridian Financial Services, XXXX XXXX XXXX, XXXX XXXX XXXX, NC XXXX Disputing the timing of receipt of the debt and payment amount. On the day that I was going to pay, the amount increased over {$200.00}. Charged XXXX XXXX fee. 
I originally emailed a letter of complaint which I have not received a reply to in writing although they acknowledge they received it. 
I have since paid the {$820.00} on XX/XX/XXXX because I called and actually spoke to the person who I originally stated I would pay on XX/XX/XXXX and she said she would try and process the payment and see if the system would allow it. She said normally it doesn't but she would try. I requested they waive the other fees since I was paying on the same date that they said the fees were added. I felt this was an attempt to collect XXXX XXXX anyway and even if I had called to pay it sooner, they would have probably stated the fee was due. 
Before sending the email, I spoke to someone that morning of XX/XX/XXXX to pay and they would not take my payment unless it was the full payment they were seeking, {$1000.00}. I stated I was prepared to pay {$820.00}. They said they could not accept that. I asked for a manager and I called the manager XXXX and left a message. He never called me back until today XXXX. 

With several communications back and forth, I asked for what documentation they had that states they can collect and that the fees are XXXX XXXX. I was told the fees are set by XXXX and they could not waive them. They've only offered to waive {$62.00} and today XXXX offered to waive only {$52.00}. 

It is the principle more than anything, with the fact that I called on the day that they supposedly assessed the XXXX XXXX that they could not accept my payment of {$820.00}, the original amount. 

Here is the email I sent them on XXXX Re : XXXX Owner Account XXXX I am writing because I have been speaking to someone in your office regarding the payment due for the XXXX Resort. I am a very busy person as most people are and I am sure you are as well. I spoke to someone on Wednesday and at that time I informed her I would be making the payment as soon as I could, and that I get paid on Friday, XX/XX/XXXX. 
On XX/XX/XXXX, your representative called me and I stated before he began his recital about this is an attempt to collect a debt ; that I was planning to call today to make the payment. He proceeded to tell me that the payment was now {$1000.00} and I stated that I am only prepared to pay the {$820.00}. Many timeshare owners are frustrated in the fact that the maintenance fees consistently increase every year and most find it difficult to pay that amount ... ... '' I called XXXX XXXX and they only showed me owing {$820.00} on that day XXXX, but said I needed to make my payment with XXXX. XXXX does not even have a website where consumers can pay. I asked for a manager that day and got voicemail. I left a message and only received a call back from him today because I called them yesterday XXXX. I think they are selling services to their customer as Early out and No cost to you dues collection. I have attached images from their website. I don't think this is fair practices. They have not produced a document from XXXX stating that I agreed to pay XXXX XXXX in collection and fees. I also asked for a copy of their contract with XXXX which they refused. I believe their practices are in violation of FDCPA as I only originally owed {$820.00} and it was paid on XXXX, my account was never sent to collection ( not filed with credit bureau XXXX. Also I would like to mention that I have a floating week and I agree I should pay maintenance fees. I normally in the past have paid directly with XXXX before I use or exchange my week.