No respond and debited more money

I took a cellphone insurance at game centurion and the premium are R75.00 per month, now hollard had deducted R108..87 and to top it the deducted another R108.87. So now my insurance is no longer R75.00 but R217.74. I have being phoning them since the 29th september with no answer. So it seems like hollard is running a **** together with game. The make you sign then the ***** your money, knowing very well they will not answer your phone. I want my money with interest and you have to pay the bank as well.