Cancellation process is a nightmare

Their cancellation process is a nightmare. I cancelled my account with them towards the end of July and I was advised it will be finalised once they have received their 5g router. CCD Couriers collected the router on the 3rd of Aug and the cancellation was finalised - little did I know it was the beginning of a nightmare. They are still attempting to debit my account till this day for “Aug month.” (Bare in my mind their Wi-Fi was not working the last week of July due to an “outage in my area” but I’d already stopped using it) I’ve contacted them multiple times to stop the debit order with no help. The amount of fees i accumulated from these debits is ridiculous.