Poor customer service

I being ********** by telkom contract.I took sim only contract with them.I received a bill of R533, when I question the call centre, I was told my spending was set to R500 which made me fall victim of unauthorised subscriptions.First of all this spend limit issue was not discussed or informed about it.The consultant reduced it to R1 after, something that they should have done it earlier, but I am not folding my hands about it.