Terrible service from telkom

Hi, I need some help. Every month I pay my Telkom account and almost every month they charging me rejection fee or double my account balance. Every month I must call them to find out what is the problem. Every month I make sure that there is money in my account. I'm just having a really terrible experience with Telkom and I so want to end my contact, when I phone them they are no help to me what's so ever and when I ask to speak to a floor manager they either aren't there ( which I don't understand because how can a floor Manger not be around) secondly is when I ask for a manager he is busy and the person on the other side of the line says he/ she will get back to me for example in 30min - 1hr and I don't get any response from them until I call again and they tell me the same story when I call. I'm getting terrible service from Telkom taking my money all the time and I can't afford for this too happen each and every month I'm sick and tired of this nonsense... I COMPLAIN AND COMPLAIN but nothing gets resolved, I need some advise on how to sort this out because clearly Telkom call center can not help me in store as well no one can help me. I hope I get this sorted asap and TIA for any help that I get much appreciated regards Na'eem