Product: Credit card or prepaid card

On XX/XX/XXXX, I along with the bank manager from XXXX  in XXXX, XXXX notified XXXX XXXX credit card company. A check had been sent by XXXX  to pay the balance of this card. We had information that this had been deposited and the copy of the front and the back of the check. The check was received by them on XX/XX/XXXX and deposited on XX/XX/2022. This transaction was never posted to my credit card account. 
At the end of XXXX, the XXXX XXXX credit card was transferred from XXXX to Barclay. 
We contacted Barclay who gave us the number to XXXX who sent us back to Barclay. Each saying we had to talk to the other. We finally talked to Barclay. We gave the information of the account then the information from the check. The information from the check was asked for and repeated 3 times before it was asked why we were going in circles with the conversation. 
Finally talked with a supervisor, XXXX  after being told it would be up to 2 months before I would hear back from them. XXXX asked to give her the next week to look into this. 
The next week, I received an email survey. I reported how poorly this situation was handled. That afternoon, the over {$6000.00} payment was posted to my account. 
I had to call back to ask for the late fee that was put on the account after XX/XX/XXXX be taken off and the interest that was put on the account after XX/XX/XXXX. Also as I asked originally that the report to the credit bureau be removed. The late fee was taken off at that time. The interest was not. 
I was told that they could not do anything about the report to the credit bureau. Was told I would have to dispute this with the credit bureau and not the credit card company. 
I called more than once trying to get the interest taken off. It finally was. 
I asked XXXX with the first call to them if I could email of the cancelled check where ithe card was paid. She said they did not accept emails nor offered any other way to send the information to them. 
They were very aware that this was a XXXX deposited check. 
A few days later, I received a letter requesting to have the copy of the deposited check to them either by fax or mail. 
I tried several times from different faxes and different people attempting to fax the information to them. There was never an answer on their end. I finally mailed them all the information. 
The second week of XXXX, I saw where the {$6000.00} was put back on my account. I called again without a resolution. 
I called a second time earlier this week without a resolution. 
Tonight I called to talk with a supervisor because I saw that fees/interest was added to my account. 
I talked to someone but asked for a supervisor. The supervisor told me that they had closed my case on XX/XX/XXXX. That they had received proof of the payment but XXXX  is who had the money and not them. Basically that I was responsible for paying them the amount. Told me it was my responsibility to get the money back from XXXX. I told the lady that they have known the whole time that XXXX  had deposited the money. I was asked to provide proof that this had happened so they could clear my account. I also told her that i had originally tried to talk with XXXX  but they kept transferring me back to them. 
I dont know where to go from here. Both companies are refusing to take care of this. 
All I know ids that I paid this account off in good faith and Barclay is expecting my to again pay them even though I sent them the information that they asked for to clear the account. XXXX previously told me that the transferred all information to Barclay. 
My understanding is that I am still responsible for paying the credit card bill of over {$6000.00} that I already paid. 
Please help me to get this taken care of. 
My phone is ( XXXX ) XXXX.