Bad service

I reported last year that I am no longer working but I will continue to pay for my contract until it expire. The contract came to an end but they are still billing me while there is no service or data received. As from last year I have been complaining about their network issues but nothing was done. I continued to just for the contract to come to an end, they are still billing me for no reason. The invoice you sent me, what will I be paying for, you canceled the debit order last and doing deposit.