MTN PATHETIC CUSTOMER SERVICE!!!!

My EIGHTY ONE year old mother has been trying to get her contract cancelled now since 16 Februrary 2021. SEVERAL emails were sent to *** with absolutely ZERO being done about the request. The contract stipulates a month's WRITTEN notice, which she duly submitted. She STILL got billed after the contract expired. So I phone 135 and 10 TIMES to try to get through to the retention department in order to cancel the contract, EVERY SINGLE TIME the call disconnects!!!!!!!!!!! I go through to the accounts department and apparently the email that was sent to *** was sent to the incorrect email address, it should be ***..... so CUSTOMER CARE couldn't confirm this???????????? This "*** DOES NOT EXIST!!!!! WHAT MORE MUST BE DONE TO CANCEL THE CONTRACT??????????????????????????????????????????? How is it that a huge company like MTN has the most PATHETIC customer service I've ever encountered?? This is a pensioner for goodness sake man!!!!! WHO CAN BE CONTACTED TO CANCEL THE CONTRACT?????????????????????????????????? ACCOUNT NO.: A***.