Iq Academy Refuses to cancel debit order

After canceling my studies with IQ Academy they did not cancel my debit order, I then phoned them and they said that there was a misunderstanding and that they thought I did not cancel. I asked them to please cancel everything as I do not want anything to do with them. A month went by and the debit order went off again. I tried calling them but they are closed until the 4th of January. They just don't care at all and keep taking money from my account.