Increase of premium!!

I have recently moved from one house to another house with the new house being only about a few roads down. After phoning in to your call centre to update my address details i get told that my premium will now be increased due to the new area that im staying in but the problem i am having is that I was staying in the same area when i started the policy with you and i am still in the same area so why are you increasing my premium. I am extremely dissatisfied and will definitely not be staying with outsurance. I am not willing to pay such an inflated amount for only third party cover. I don't understand why i am being charged more for staying in the same area.