Why do insurance company's think I'm trouble when I tell them my registration number? (UK)?

I cant get any quotes under £2000 and all the insurers cant provide a quote, could someone have cloned my license plates cos I got a few phone calls saying I crashed into someone under their insurance or I was crashed into or something... Its only a Peugeot 206 gti, its not amazingly fast but its got a nice engine, I bought it because it didn't need a tonne of work done and it had mot and tax and I've been insured for 7months with accelerated no claims bonus so that counts as a year as far as I know??? But the cheapest I've got so far is £4068.77 with telematics i need something preferable under £1500,