Change insurance again

Hello guys, I bought a caravan 4 weeks ago. In advance I had talked to my insurance man about the Axa.He had made me an offer which had listened well.So I had obtained a number (formerly cover card).The WOWA registered. Was now on vacation (not with the WOWA).When I came back now I wanted to make nails with heads.The specified value of the WOWA is 22000€ and the contribution is much higher than in the offer. I’ve never had the number 800€ on the screen. Now the good man wants 850€ VK a year.Frank!! But since I didn’t have anything yet and have not signed yet it should be possible if I unregister the thing again and then register with a new number from the other insurance company e.g. DEVK,or??? Does anyone have any idea? Please for help!! Greeting Freddy101