For the past month I’ve been going back and forth with tracker on my cancellation

For the past month I’ve been going back and forth with tracker on my cancellation. On the 30th of May,I paid the early termination fee and sent a POP to the relevant email addresses I was provided with. I even called in and tracker confirmed that the payment was received. It’s not the 18th of June and tracker has sent debit order mandates to my bank and they say I’m in arrears with my account. The service is pathetic