Worst service

I gave notice and cancelled my contract wich ended August. My last installment was to go off 1 October. 1 October an increased amount went off. 1 November another amount went off. Tried to email customer service... the mailbox is full... tried phoning... after holding on for 15 minutes I said I want to speak to someone regarding my cancelled contract for which the debit order is still going off... lady said "please hold" and dropped the call... worst service