no service

I recently moved 4 blocks before completion of a 24 month contract with Dish Network. The tech they sent to move my service was unable to aim the dish at the only avaiable sattelite due to a large tree in a neighbors yard. Dish Network is requiring me to continue to pay them per my contract and tell me that they are not required to provide service as it was my choice to move. My other option is to cancel my contract and pay the cancellation fee.