No customer service at customer service

I've had issues on my MTN account (previously with Nashua Mobile) since the beginning of the year. There are data charges for apps I never downloaded and websites I never visited. While at Nashua Mobile, after much correspondence, an IT guys agreed there was an issue. Shortly afterwards they moved me to MTN where I have tried to get this sorted. NOONE EVER answers the customer care line or replies to emails. I can't sort it out because no one at MTN gives a damn that I have had the same MTN number for almost 13 years and has another MTN number for 6 years before that. Does MTN not give a damn about its customers? Why do you have a customer care line and email if no one works in the department? Why do you think it's ok to have billing errors and not sort it out? Like I mentioned in one of my emails (to which I still have not received a reply) out of my group of family and friends, I know about 30 people who have recently left or are leaving MTN because of poor customer service and billing errors. My line has been suspended because I thought maybe if I stopped paying the outrageous bills someone might actually call me to sort it out. Silly me thinking MTN would actually care.