If you’ve tried to cancel a service, stopped using it, and stop payment... well, the rest is their problem.
If you're going to play that game, you'd better be very sure that you can prove you made all reasonable efforts to cancel the service. Otherwise, blocking a payment method does not absolve you of any obligation to pay for something you agreed to, and you can be pursued for the money (and often interest/fees/legal costs), and if that's all there is to it then you will lose in court if things get that far.
If you're going to play that game, you'd better be very sure that you can prove you made all reasonable efforts to cancel the service. Otherwise, blocking a payment method does not absolve you of any obligation to pay for something you agreed to, and you can be pursued for the money (and often interest/fees/legal costs), and if that's all there is to it then you will lose in court if things get that far.