Ourtages increase in insurance premiums after yearly "revision"

I received a revision of my housing structure insurance for 2020 and the premium has increased by 24.7 %! How is this possible. I expect an complete adequate revision of the policy with in depth calculations and reasons for any such increase otherwise I want an immediate cancellation of the policy. I have not received any feedback whatsoever from Auto and General thus far.

I recommend anyone reading this who has a policy with Auto and General to carefully go through any policy revisions as it seems the clients are being taken for fools and given outrages increases in premiums without clearly stating the reasons for this.