Unauthorised debit after cancellation

I got a call to join up and you are so rushed to make a decision over the phone. I then instantly regretted it and did not sign the debi check mandate and I emailed them within the 5 day cooling period to say I want the subscription cancelled. I got an email weeks later saying it’s done. Well this month the took the money off my account regardless. The website doesn’t even give you contact information for any one and neither do the emails. This company is not user friendly and make it so difficult to get hold of anyone. I do not recommend signing up for anything from them regardless how good the deal may seem