MTN South Africa

I have a pay as you go contract with them. I was on holiday out the country. Put on my own airtime. When I got back to South Africa and went to pay my contract I was charged for international call.i ask them to look into it. So I got a sms from MTN say it Resolved but every week my line is cut. So today I just went and payed it. I feel that there is no love towards the customers and don't want to be help in full. There has been number of time that it was put on the system but not getting sorted out.i will just like to let you know and how bad it is at MTN.