insurance raise for C7 owners

So I've had my C7 since April , the insurance for the C7 didn't seem to much more than my SRT8 or my 2013 mustang GT so i didn't think it was to bad. All of a sudden this past month i had my renewal and OMG the premium for the vette jumped almost $300+ I couldn't believe so i called my insurance company who i been with for over 15 years and i have had 0 accidents and 0 tickets with. They tell me that the insurance for the vette was not calculated correctly and this was a country wide hike in price and not just a new york thing.

So anyone recently seen a huge price increase in their premium for their C7 vette ? This is just stupid, this jumped in cost was almost 1/3 of total premium.