Abused Client

I opened an account with Ackermans, then I lost my job and could not pay. On February 2020 I was offered a deal and was told to pay a certain percentage to clear my credit. I paid but I am still receiving calls despite numerous attempts of explaining that I have paid. The funny part is that when i explain i was offered a deal and paid, they can see it on their system and tell me they will send a paid up letter shortly. I even sent emails asking for a paid up letter, I havent received it but im still being abused with non stop calls and it is affecting my credit score.