Telkom billing problem

I have 3 mobile contracts with Telkom mobile. The first lot of 24months contracts have ended and already about a year into the second period of contracts. Telkom has add on an internet bundle onto my wife's account. Despite having it removed several times and credits passed still this issue still continues. Even now that we have upgraded into the next period of contracts still problem still continues. I really can't understand why something so simple cannot be resolved and I'm having to pay for this every month. This is absolutely ridiculous and *********.