Stop Debit order

This company is debiting R169.00 from my account which I don't know what is it for because they are dealing with plumbing and I don't have any contract with them. I have a contract with On-Air TV, what surprising me is why my account number for On-Air TV looks the same as Safe Base, the only different is the last number at the end. I called my bank to stop this debit order they advised me to contact them directly because what they are doing is ***** by debiting without my concern. I called them 5 times today to explain what is this for, nobody is talking to me. Every time someone answers the call they put it down.