Thank you for renewing your policy with Dynamo cover.

stclaim_2

If you did not notify change of address, you are in breach anyway. If you had had an accident you would not have been able to claim.
When you took out the policy it states that auto renew will take place unless you go to your account to stop it.
I know because I had Dynamo cover myself.
You will find that, until recently, new customers did get greater discounts. Just about everyone knows this.

I do not see that you have a case.