failure to debit acc

Since March I have been trying to update my banking details with MTN however this was not done and my service was suspended. I then tried to call the customer contact centre and was on hold for more then 3 hrs. At this point I had sent an email to mtn to have this done I recieved a confirmation from mtn stating that my new banking details were updated and effective 01/05/2015. I however continued to hold on to confirm with a consultant that this was true. She assured me it had been updated and reinstated my service and apologised for the negligence of the service provider . I offered for Mtn to do a debit on the same day which they gladly did (14/04/2015) And reinstatefd my service. However in typical pathetic customer service MTN did not debit the account again this month and now my service is suspended again . I have been on hold with mtn ( called 808) the entire day again and have not been able to get through to a consultant. This is truly in inconvenient to me as I cannot use my phone for any emergencies and it's not even my fault. Mtn needs to catch a serious wake up as there systems and ways of communicating with there client base is I dire need of improvement.