Poor customer service

I took policy aone yeara ago and everything was fine until yersterday, i went to the garage to fillup my petrol tank only to find out that i dont have any cash on my bank account. When i open my statement i realized that Metropolitan took my money and the agreement all these years was debit order only go off when i get my salary wich is every last day of the month. Worse part is when i contact them the only thing they did was to send 5 same apologies emails. That how they treat their customers and now i was left with stranded at garage because of Metropolitan poor and not caring service i want to cancel their policy they don't care about their customers at all