Terrible customer experience

I've been with MTN for well over 12yrs, I have never experienced such horrible customer experience. I have had countless interactions with MTN agents regarding my contract. Some agent changed the payment method while attempting to upgrade my second line since the contract ended in October. It appears that that action may have caused some changes in the profile as MTN were unable to debit my account instead expecting a cash payment. I was not aware of this until I got sms's, so one of the agents loaded a JAB payment for the outstanding amount and asked me to wait 24-48 hours. Spoke to another agent to verify the payment method it was now showing debit and I had to re-accept the debicheck and was told this will be rectified, I should wait another 24-48hrs. Only to now have my line suspended due to their agents and system incompetency. Now their systems are offline, the very same systems we need to rely on.