same sort of thing happend with me, i got a quote online of peter best on a e30, quote came back at 400quid so i went and bought my e30
rang them up to pay for it to for them to say that theyve changed there policy so you now have to be 25 to get insured by them and my new quote was 3k!
had a argument with the woman saying why havnt you updated the site for them to say they havnt got round to it!
i slammed the phone down and went and paid for the policy online haha.
went out in my car and the next day i get a email to say im not insured haha.. it was worth a try though