Standard bank Bogus vehicle insurance

Standard bank financed my vehicle purchase on April 2018 and the car was insured before leaving the dealership. To my surprise the March 2020 installment was a R1000 higher than the normal on enquiring with Sandard bank I was told the additional amount is for insurance. My question is who authorised the insurance because the vehicle has been insured from the date of purchase. No one can give me an explanation from customer care line. I then reversed the whole amount and I am gonna only transfere what we agreed on.