Alert ⚠️ unauthorized debicheck

I never app**** for anything from this company but they are debiting money from my bank .I don't know them ,I never gave them permission, what is worse they manage to do debicheck,how I don't know.I never accepted any mandate or whatsoever. I never heard of them until they sent me an email telling me the premium .Immediately I emailed them to say they must cancel that policy as I didn't apply/ approve of what they were about to do .I'm 100% sure these are ****mers .Very difficult to get hold of anyone there.