Just insure a already insured car and just debit.

So last week i received an sms stating that a change to my VAF debit order will be made. I didn't take much notice as what could possibly change. On the 31st of May i received a email with my new insurance that will be deducted with my VAF debit order. I immediately get into contact and send my proof of Insurance that i have since day 1 through to them. So they didn't want anything older than 3 months i resent a letter from my insurance stating all information. The 1st,my account was debited with the new insurance. This is not legal!!!! No communication except for a sms and then a letter with my new amount not long after that and less than 7 working days to respond and just boom, deducted. You guys must be desperate or something as this is not how you do things!!!! I want my money back!!!!As quickly as you debited it!!!!!! As i can't pay double for insurance!!!