Mediacom review: Cable service

We made a payment of $96.66 which cleared 9/23/20. An Encoding error was done by Mediacom by only deducting $46.66. Upon us realizing their error we called our bank and they did a check adjustment request Federal Reserve Bank 10/2/20 for $50.00, with a copy of our check front and back. We called numerous times with no correction. Then I was told to take a copy of the paper work from our bank to Mediacom office in Albany, Ga, and I did on 10/6/20 and no action has been done as of 10/12/20. Now they said my bank has not sent it. We have talked to many agents with no action. Where is the $50.00 that was sent to Mediacom? They keep telling us we have to pay the $50 or we will get a late fee. There is o one who is actually able to handle this situation. We are senior citizens.
Would like to know if any others have had this problems, we haven't before.