Rented monthly storage unit. Paid year off. cancel after 1 month. Owner will not refund. He crossed through monthly on contract and wrote yr lease.

I rented a month to month storage unit and paid 1 year up front. My stuff was stolen within 2.5 weeks. I paid a year up front. Manager had me temporarily move the few items left to another unit because mine was damaged from the break in. A week later I told the manager I no longer needed the unit because most of my stuff was gone. The owner will not refund the rest of my money for the year. He said when I moved my items to the new unit that was supposed to be temporary I automatically agreed to new terms and conditions. My contract has a different unit number. I agreed to move my stuff just temporarily. They alerted the contract putting a line through typed month to month and writing year lease in pen. They also wrote on the contract that I wanted the new unit and agreed to it. Again in pen. I never consented to any of these alterations. What are rights? What can I do? And can I go after them for legal fees? Also they promised cameras and the ones by my unit were broken.