Debits Anytime of the month

This company deducts money from my account at any time of the month. This month they just decided to deduct money a day before my pay day and the debit order was returned unpaid leaving a negative balance on my cheque account. Last month they did the same thing twice leaving a negative balance on my account. I want them to compensate me for the money I've paid to my Bank for failed debit orders and rectify this issue of unauthorized debit orders or I'm cancelling this contract and taking this matter to the Ombudsman/ Consumer Protection Counsel. I will not be blacklisted for this ****. This is the only company that has failed debit orders on my bank statement because they choose to deduct when I do not have money in my account whereas I gave authorization for them to deduct money only on the 27th of each month or on the last working day before the 27th if the 27th falls on a weekend or public holiday. I regret for taking this contract that's going to damage my ITC Profile.