ADT refusing to cancel subscription

I have been trying to cancel my subscription with ADT since last year.

Initially they offered 3 months payment break which I accepted with the hope my financial situation would change.

I then called them to cancel my subscription from December as my financial situation had not changed. I April I sent them a follow-up email as they kept on trying to debit my account.

This has been a nightmare dealing with this company as they seem hellbent on making sure I remain subscribed with them even when I cannot afford to. This is so frustrating.