CELL C - USELESS CUSTOMER SERVICE NOG WEER!!!!

Useless Cell C - After the debacle of 2 weeks ago where they had suspended my service after I had paid my account in full they are at it again. I changed my bank account and informed Cell C on the 30/6/2021, giving them a months notice so that when end July came along, they could debit the correct bank account. So, even after I have received emails confirming that my account was paid in full and been allocated, they have just tried to Debit the incorrect bank account for 4 MONTHS! Of which 3 have been paid!!!! So when I phone and try and sort this out, they won't proceed with my query as I don't pas their security questions....,and guess which question is wrong....MY BANK ACCOUNT (I can only assume this as they refuse to tell me which question I failed) - I am at the end of my tether now. I have NEVER had to deal with such a useless bunch. The left hand does not know what the right hand is doing. `One good thing is that within about 10 minutes i will receive a call from them - They monitor Hello Peter 24/7. God forbid a bad review gets out into the public domain