Rain still debiting my account even after contract has been cancelled

Cancelled my contract with Rain in October and amount was paid for October. Connection got deactivated on the last day of October, Rain came to collect their router and everything was inside the box. Today I am surprised they debited another amount and not even sure what this amount is for.

I believe that if their is any default by any party to the contract you have to discuss now I am not even sure why you are still debiting my account yet for starters I cancelled the contract because of poor service.