Poor Customer Service

I complained in June about an amount that was deducted from my account for a tablet contract and they called me and indicated that it is additional services that causes the extra amount. The lady said she will remove the services and that the right amount will be deducted from my account on 1 July 2015, on 1 July when the amount was deducted it was still the larger amount. I have tried to contact them several times and every time they say that someone will get back to me. I can not keep paying this huge amount for \services"I do not want. No one is responding and is getting on my last nerve."""