Extreme Bad Customer Service

I had a Wi-Fi router from telkom that was a 2 year contract. When the contract expired in April they decided to increase my premium to R250, none of them could explain how it got to that amount without my consent. I cancelled it in Aug and a Consultant called me to offer me a month on month deal of R99 of which I accepted but it never happened as they continue to debit R250. I have cancelled it again and this is the reference number ***0 I got and no one called mek this time, I just received an sms that this has been cancelled. Can Telkom stop debiting my account and refund me my money with immediate effect as I have no contract with them.