Contract terminated appropriately but continued charges more that triple original costs

We terminated our contract within the agreed contract terms and conditions in January 2017. Planet Fitness has not breached their agreement by not only terminating the debit orders against my account but they have increased the debit order amount without any correspondence with me and without my consent to more than triple the amount originally charged each month. i have been to the gym in question, They confirmed the gym contract was terminated on time on their system. I have spoken to the customer services (Sibone Mashigo) and he also confirmed that the contract was terminated on time and on their system. He could not identify to which account/s the debit order amounts were now being allocated to. He further promised that he would have the investigation and situation resolved within 24 hours and my money would be returned. That was more than 3 weeks ago! I have had no correspondence from them, no resolution, no refund of money and no confirmation that these ********** debit orders would be stopped.