Taking my business somewhere else

I have been with auto and general for more than 10 years and I have never been so disappointed with their service, a week ago I get a policy review email informing me that the insurance premium is going up obviously I give them a call trying to get a review for my policy, my calls where not answered then I sent a call back request and an email still I haven't received a response. I shopped around for another insurance and got a very affordable one but now I can't get hold of the to cancel the insurance to avoid a double deduction