Unprofessional service

I have cancelled my subscription with the company and have returned the device back to the shop I collected however an attempt to debit my account was initiated this morning, this is causing financial strain and anxiety as now in order to have other service providers im contracted get their money when they debit, i had to change my accounts.

I live in doubt as to when the next debit will try to go out even after I cancelled the services. I request a stop to this.