Misappropriation of premiums!!!

Misappropriation of premiums! I get a call from a guy saying he's an agent at Gomo (We buy cars) where I just bought a vehicle and he wants my insurance confirmation of cover which I send. I then received an SMS stating that I now have total loss cover with Gaurdrisk and the UNAUTHORISED premium will be debited as part of my vehicle installment. This is NOT the mechanical warranty as that was made part of the finance agreement. Gaurdrisk listen up! If you debit one cent from my account I will open a case of ***** at the commercial crimes unit.