3rd party billing on my account

I had a cell phone account for 2 months now for R5632. Wich never happened before. I have been asking for assistance for a month now. This morning the call centre gave me numbers of myra networks and wia media. I phoned them. They have nothing on record on my cell number. I dont get any help or corrections made to my account. I will be taking this further and put a stop to the account if i dont get a refund. I have been a customer for a long time. Please sort this out