Struggling to cancel policy

Trying to cancel an extended maintenance plan last week that I cancelled within 24 hours of agreeing to it telephonically. I phoned customer care this morning and spoke to a consultant that seemed very impatient with my request and I was told that I would still be debited the first monthly installment as their cancellation period is 14 days. After that it would be my responsibility to reach out to them for a refund. If I understand the Consumer Protection Act correctly, they are legally forbidden from taking money from my account to collect funds once I have submitted my cancellation notice within the cooling-off period.