Shocking Service, Exhorbitant Account

I have had a contract with MTN from the inception of cellphones. My account in the past few years was around R450.00. I am not one for using my cellphone for anything much except What's App and very few calls. In the past couple of months, my account has doubled. Trying to get anyone to give one an answer to how this is remotely possible when your phone is suspended (despite the account being paid timeously) is impossible. I have left my phone as "suspended". This is highly inconvenient because should the need arise, I cannot make a call or send a message. I have therefore only used Wi-Fi connections to utilise my phone. My December account is due, I call the number to establish the next balance due and it is higher than it has ever been. Forget getting an answer. It is almost impossible to speak to a human and nothing has been resolved despite complaints since September 2018. As soon as I can cancel this contract, I will do so. If you are looking for a provider, steer well clear if service is what you expect