I'm being billed for services I don't know, I want my money back!

It's been over a year and a half that I've experienced bills added to my account that I don't know and no one xan explain. There is ***** happening with my account. I bought two tablets for my kids and the bills charged on one of those contracts don't make sense. I have been billed so much money that accumulates to more than R10 000. I called the call centre many times and get different stories and given information that didn't help me. I've been to in-store Telkom so many times and met one person who was willing to assist me and I've been to the store so many times to check on the progress but nothing has been done even after we lodged an investigation. I've been paying too much money for things I don't know. Please give me back my money.