Bad,bad service appalling to say the least

My husband had a contract with Cell C which was due to expire in August 2018. We visited a store and they gave us a number to cancel the contract. My husband called and communicated the same, he was assured that it was done but he should take a data contract. He agreed because it seemed a good deal. They still continued subtracting debit orders every month and we did not query because we didn't know what was going on. Then his account was handed over for collection because he skipped one month's payment. They keep sending him threatening him on sms. How is that possible seeing they debited his account every month? We then went to a branch in Kimberley as we were visiting our daughter. They advised us a new contract was open and that the other two were never cancelled and that none of the payments reflect except the new contract debit order. Is this bad service or what? He went home and called again on the numbers given in Kimberley, they told him he is in arrears the payments were never received he must query with his bank, how is that possible when the payment was never unpaid on his statement. Hellloooo are we missing something??????????? For goodness sake, a simple instruction complicated by *********** people,? Please help about to pull my hair out or go the legal and Ombudsman route. Forgot to say contract came with a tablet that never worked, paid us out cause they didn't have stock but we're still paying for it. Don't know what happened to the 2 years data that we never used.