Pathetic service!!!

I switched banks from Capitec Bank to Nedbank in the beginning of January, appropriately I received a confirmation SMS on 4 Jan from MTN advising that the account details have been updated accordingly.<br> <br> I however later realised that the account details were never updated as my new account was not debited on my pay date. I made contact with your Call Centre on the 28 Jan to find out what was happening and was informed that they tried to debit my old account. I explained to the agent the situation, gave her the correct account details once again and requested that they debit my new account. I also received a confirmation SMS on the day again.<br> <br> Yesterday, MTN decides to put a stop on my account for their negligence and incompetency. Do you realise what inconvenience this has caused? I spent over 6hrs waiting for a call centre agent to assist me