No response to requests to investigate billing

I have no idea where to begin. MTN has become one of the worse in customer care and technology is lagging behind now. it takes 20 minutes just to get to speak to an operator (lucky if call is not dropped). Then you speak to people who actually have no idea what is going on. You try escalate, they promise to send you an sms to tell you they investigating. It never happens. I phone '808' 3 times a week. Nothing. Email them, nothing. I am still waiting for 2 matters to be resolved going back to August now. Where to from here? No one bothers. So what is the next point of call? In a separate incident yesterday the Customer Care Consultant **** about the promotional data on offer resulting in me spending money I shouldn't have. Who is going to refund me for his mistake? How can we trust any of them? Do they actually get training? Do they actually care? Afterall, if it is not for people like me, MTN would not be in business. I cannot believe how pathetic and apathetic MTN has become in the last 2 years. I cannot support them after my contract ends next year. I just can't deal with them anymore.