horrible cancelation process

I am so frustrated by MTN, I tried calling from the 29th of May and the cancellation/retention department will get disconnected more than 5 times on different days. On the 5th of June when I finally got hold of the consultant he told me to pay a specific amount to cancel, long story after 3 constant while waiting at the MTN store for an hour, I finally got a reference number and the correct amount to pay. I was told I need to call back after making payment, Ref 1-***6. but on the 12th the same number I cancelled is still receiving data & minutes and I am being billed again and the amount I paid at the MTN store and verified it will be canceled. On the 25th of June MTN debit order didn't go through, only realizing it now, which means MTN thinks I was paying in advance. I have been with MTN from 2013, this is what loyality gets you.