No allocation of payment made

I have an account with MTN. On 29/6 I made a payment of R750.00 on my account A***. My service has been suspended. Since then, I have send a couple of emails with proof of payment. With no response. My service is still suspended. I can't get through to the call centre. It is closed. It is now 11 days after the day that I've made the payment and still my line has not yet been connected. It only means that the payment has still not been allocated to my account. I don't know what to do anymore to get their attention. I've filed a complaint, my service provider also send proof of payment but nobody has responded yet. please help.