Disrespectful

When I got my contract with Telkom, I made it clear with the consultants that my account was supposed to be debited on the 25th as that is the date I get paid. Telkom on numerous occasions debited my account on the 24th but last month in particular they debited my account and found no money in the account which lead to the bank charging bank charges on the account. meanwhile I was under the impression that the account was paid, no phone call, no SMS as to say that there's something wrong with the payment, I receive yet another debit order from Telkom and then a statement follows shortly afterwards stating that I owe double of my month premiums and an additional R290 for penalties. Now this is totally unacceptable. Lerato the manager says to me that an SMS was sent out stating that my account would be debited on the 24th , an SMS I never received and even if I had received it, I get paid on the 25th. Where am supposed to get the monies? She couldn’t answer the question. I went on to ask her to cancel my debit order and that I will be loading a stop order and she told me that that won’t be possible as I still have an active account with them. After engaging with the manager, it’s very evident that Telkom thinks they know my financial situation more than I do, they think they can bully their clients with their underhand tactics. My account with them is not I arrears, they’ve never went into my account on 25th and not found payments. I will not allow this company to over indebt me. I refuse! Please reverse those penalties charges because your to blame for them and not me. I WILL NOT PAY SUCH monies.