Planet Fitness deducting money from bank account - contract is cancelled

We joined Planet Fitness and paid joining fee. The next day after joining (we had not even gone to the gym) we got an email to say that our banking account has not been verified so we must provide new banking details - there was nothing wrong with our banking details but still provided my business banking account as well. When we went to the gym the next day we were embarrassed at door and would not be allowed in because our banking details were not "correct" We decided that we will cancel this contract as this is ridiculous. I called through the next day and emailed my cancellation with immediate effect. Month end comes and the banking account ) which was not good enough for them and was not verified had been debited) they then debited again and again and again, I cancelled with the bank and they still continued to debit small amounts going off continuously. We have been verbally abused by the call centre agents who disguise themselves as attorneys - continuous phone calls even after we have send them cancellation emails confirming from Planet Fitness that we cancelled. They have debited again another R600 on the 1st April 2018. How long is this going to carry on for? I have called them over and over and no one gets back to you, they cant even take down a correct email address. Totally *********** accounts department and performing ***** on my bank account by deducting monies without my permission.