FORCEFULLY DEDUCTING TOP UP INSURANCE FOR VEHICLE

I bought a vehicle recently from standard bank vehicle asset finance department, they included top up insurance and paint warranty onto my monthly premiums without verifying with me, They are calling me continuously for the payment shortfall and I explained to the customer service about the issue that I did not request for this. There is clearly a communication barrier between themselves as I explain to each custom service individual the same thing over and over again, Clearly they should call the agent who signed up the deal with me and resolve this case, Currently they are still demanding the payment from me, They gave me a number to call who deals with motor insurance - they don't have this on their system - whats going on there??