insurance proof

i have received the email below from VW and i have sent my insurance copy more than 3 times. today i got an email from VW they want to deduct an additional 600 i have been calling the number *** and they don't answer.

Dear MISS MVUZA

ACCOUNT NUMBER: VEHICLE DESCRIPTION: VOLKSWAGEN POLO VIVO 1.4 TREND

Confirmation of your comprehensive insurance cover

Our records indicate that we have not yet received details for the comprehensive insurance cover for your VOLKSWAGEN POLO VIVO 1.4 TREND.

Please send us proof of your comprehensive insurance cover within 7 business days.