ON AIR - NOT WORTH THE TROUBLE!

After having cancelled my debit order with On Air, and paid my subscription in full, they are still debiting my account for the subscription. When you call the Call centre you speak to a AI BOT to get through (no personal touch) although the call centre staff have been very friendly while I explained my query on a number of occasions they tell give me a reference number and say they will "ESCULATE" the matter to their billing department. There is no contact for the billing department and NOTHING is resolved! How many times must I ask them to stop debiting my bank account (I even cancelled the debit order with my bank) and yet somehow they get it right????