not allocating of monies paid

I paid my account vis eft on the 15/05/2015, and sent proof of payment through to MTN on numerous occasions requesting proof of payment to be allocated, HOWEVER, they keep supending my account as they say i am in the arrears of the exact amount which was paid. how many times must i call and hold for 30 - 40 mins before they answer and explain the same thing and e-mail the same proof of payment only to have it not allocated again, and again and again.<br> <br> I WILL NEVER RECOMMEND MTN TO ANYONE<br>