Being billed for data but never receives it

My Dad is a MTN customer since I can remember. Never having any complaints about them. But the last 4 months were absolute hell. He is being billed for data which he never receives. When he buys his own data MTN somehow manage to even take that away from him. We have been to MTN. We have spoken to the call centre and still nothing has been done. I'm serouisly thinking of going to the newspapers and ending his contract with MTN and moving him to Vodacom. Nobody is resolving this always passing the backet. I'm getting GATVOL seeing him like this. Why stay with a network who is useless. MTN can phone me. I will be waiting. If nobody from the network phones me I will take matters into my own hands. Just had enough. Serouisly.