Extra Space Storage Will not pro rate my month, taking my money without cause. troy Nationwide

Called my storage location and was told  that I would not be getting a refund for the 3 days I am not renting.  I paid for the entire month in  advance and was told on the website that ti would be refunded on the days I do not use.  When I called and spoke to the manager, I was told and very rudely that I would get NO refund or pro rated amount.  This is unethical!!!  I am not using services for 3 days, have always paid on time and been a great customer.  It would be like going to the grocery storte paying for $100 worth of food and only getting $75 worth and the store telling me too bad you paid for it and we are not giving you a refund for the items you did not receive.  This place is shady at best.  In the few years we were there it changed 3 different companies and the rates went up over $49 dollars.  I would not recommend this place to anyone. They will charge you for a full month of rental even if you do not use the full month.  I shouod be prorated and refunded for the days I am not using it.  The girl said they would not refund me because I paid for a whole month and even though Im not using the whole month I pretty much used the whole month, so they will not refund me for 3 days of not using their service.  very disappointed in this company.  BUYER BEWARE!!