BILLING/CUSTOMER SERVICE

I made an online payment in April 2018 to pay my MTN bill. MTN says that they're unable to locate my payment, I've called them atleast 15times in the last four months trying to resolve this issue, ive sent them a copy of my bank statement at least once a month, each time I call them the consultants asks me the same questions relating to the query. So as you can imagine each time I call I have to repeat myself, after four months there has been zero.. ZERO progression on where my money went. Each time I ask to escalate I get placed on hold for about 10-15min and then BAM call drops... and guess what, MTN is UNABLE to make outgoing calls so yes NOBODY EVER calls you back... managers dont call you back, staff dont call you back, you're required to call MTN each time only to have to repeat yourself to somebody who has no idea how to help you... then drops the call on you.. my phones now suspended,even though I have an open billing dispute, MTN refuses to unsuspend me.. seriously!!! Do they even have any idea how frustrating it is to call every time and repeat yourself and have the call dropped on you?this is PATHETIC CUSTOMER SERVICE... actually MTNs customer service is NON-EXISTANT