Beame Matrix keeps deducting payments after cancellation

I cancelled Beame Matrix with 20 business days notice, as per their terms and conditions. Note that payment for this service is in advance. Mails to customer care come back undelivered and it is impossible to get hold of a humam being to assist. A debit order was again deducted despite cancellation and having been assigned a reference number - I was referred to a service bot, which I doubt will in any way resolve the issue. I have no faith that this tracking service could find my car if it is this hard to get hold of someone to assist to stop a debit order for a service that was cancelled. Very disappointing and frustrating.