pathetic service

<div>i am extremely disappointed in the service i received from MTN, i contacted the call centre in april when i have changed my banking details and was ensured that it has been updated and that my debit order will go off my new account the following month, today i received an sms stating that my account is overdue, i contacted the call centre and spoke with ***** who was not very helpful at all, she advised me that when a d/o comes back unpaid it cancels automatically, what **** is that? i contacted MTN on the 28/04/2015 and advised the agent that the d/o needs to go off my new account and never did she mention that i was changed to a cash payer, i have not received one phone call either from any mtn collections agent, and i dont understand why if i have not paid was my line not cut like it was done 7days after my d/o came back in feb/march? i want a manager to call me as i wanna listen to the call where my banking details was updated and where i specifically confirm with the agent the next d.o date, i have been a client of MTN for a long time now and this behaviour of your agents is unexceptable, i RFEUSE to pay any interest accumulated over this time period!!!&nbsp;</div>