MTN debit order full amount of I was ****med and wanted to make a payment arrangement

On the 6 October 2020 someone phoned me from MTN and said there is problem with my sim card and that they need to do a sim swop as I am a pensioner I did not know of better and gave them my OTP number and after that they increased my account to R11000. I then stopped my bank and MTN account , MTN call center was offline after holding on for 45min. Then told me they cant assist me. The next morning I went to N1 City Branch who then assisted me . The salesman was Daniel very helpfull and we did a sim swop. He told me to send my ***** report claim as I did with affidavit etc. The email adres i send it to was *** up till now I have had no response from MTN of the ***** departement. I also cancelled my debit order and told them that I want to pay my contract cash every month as I will be able to afford that big amount and wanted to make a payment arrangement. This morning 01 Dec 2020 my bank account was credited with R10897.00. I am a pensioner what to they think must I do for the rest of the month. I know I was ****med and liable for the money cause I gave the OTP number. But no feedback from MTN or the ***** department. As I was willing to pay the money off I was just waiting for someone to come back to me after we send a 1000 emails. Very bad service from MTN ...