Wrong room booked

I booked at this hotel 6 months ago on the 19th of February ,once I booked online I called the hotel reservations directly to ensure that I have a sea facing room on the 3rd floor,with a king bed and bath and shower.I have also called during the week to ensure that my booking is as I have required(called Thursday at 17:30 and spoke to a guy in reservations).the manager that tried to assist us tonight is aware of this phone call that was made.i am extremely disappointed as they have completely ignored my request,I would have booked at another hotel if they could have informed me that they won't do anything about my request.Tonight when I checked in the only excuse was:we are fully booked. what about the fact that I called Your reservations 6 months ago?i now have an awful room with no sea view and a wall on my left side of the window and only a shower when I look out.i will not book at this hotel again,it is a complete waste of money. I can't believe that your staff confirm everything is in order telephonically,but when I get here it is as if I have just booked tonight .thank you for your awful service.