Unhappy with their service

I spoke to a consultant and then after ending the call I felt I made a mistake by agreeing to take the cover so I didn't reply when they sent me a message to approve the debit order. I was supposed to reply to that message, but even though I did not. It seems like they are going to debit my account month end because I checked my Capitec app. I have been trying to cancel the cover, but nobody is responding to my emails. They are ignoring them.