TOPUP CONTRACTS

I have 3 topup contracts with MTN and I noticed on my last bill date of 20/05/2015 that MTN have billed me incorrect subscription amounts than what I have sighned my contracts for. This is a breach of contract on MTN's side since I as the customer did not agree to this amounts that I got billed for. The numbers in question is ***, *** and ***. MTN is not keeping their side of the agreement and I will not pay for this. MTN is misleading their clients when they give them topup contracts with fixed subscription amounts. The amounts that I have sighned for is valid for 24 months so how can MTN change this without the clients concent?<br> <br> It doesn't help me to call 808 since no one answers the phones anyway and we don't have a branch in our town in ***amas. What should I as the customer do to get service?<br> <br> I want a refund for the money that MTN is *****ing from me. I will cancel all 5 the contracts that I have with MTN as soon as they expire.