Traders Insurance Cancellation

Not sure if this is correct forum but really need some help.

On Friday 02/08/19 I took out motors trade insurance. I used a company called Peacock Insurance Services. I paid my £300 deposit and was told thats it set up.

I then received a letter today 06/08/19 dated 05/08/19 from a company called Policy Plan saying my insurance was cancelled with no explanation.

I immediately called Peacock Insurance and they said Policy Plan have wrote to them saying I got a question wrong in my application so have cancelled due to misrepresentation. When I asked for my money back they have told me Policy Plan are refusing to give me any of my £300 back.

I am furious. Not once was I emailed or posted any terms and conditions from either company telling me of any cancellation fees. This surely cannot be legal.

The question I got wrong was they asked me if I used to be a director of a company. As it was over 5 years ago I said no. Its not even a major thing and cant understand why this would even prompt cancellation.

I have wrote to Peacock and Policy Plan. Only Peacock have replied today saying they need to wait and see what Policy Plan says even though I only dealt with Peacock. They have said it can take up to 8 weeks for a reply. I cant wait that long for my money back.

Any help would be appreciated.

Thanks