MBD harassment.

My father had a small outstanding amount of R3600 with absa(charges and all sorts added). We in good faith contacted them to attempt to pay. This account lapsed over Covid due to circumstances and dad being ill which took almost a year to recover. We paid R300 a month which was said to be fully paid over 12 months. Then we discovered interest.was being added. They began calling everyday after I again attempted to have the amount reduced as he is 77 and not well, on sassa and unable to pay. A lady got back to me on whatsapp and I said we could pay back max R1000 splitting it over 2 months. On whatsapp she agreed but I asked for an email confirming the agreement and a settlement letter at the end. She asked for my email address which I gave. I have received nothing. I message her every week asking for the info. Nothing. I now get called twice a day, today already 4 times harassing me concerning this. Today I got angry as 2 days ago a lady called. I explained to her that i have been speaking to someone on whatsapp and I am waiting for the mail so I can proceed to sort the payment. She said she understands and they would sort. Today I got a lady again harassing me. I got angry and raised my voice as she talked me down. She kept saying I have no rights to be angry and who gave me the right. She told me I am not being nice. Please... how can you speak nicely a hundred times and have to do it a hundred times more. I have not tried to evade this payment in fact been trying to get it sorted. I am done with these people. She got unprofessional and rude to me. If rhey can't get people who do their job and stop harassment then good luck to them trying to get money out of decent people... I was angry... I receive calls just after 7 am every morning and then again late afternoon. Previously they kept dropping the call. Today she would not let me explain so i hung up. She then proceeded to get aggressive about me dropping the call.