I was booted from paid EC+ seats to 45 C&D, saw on check in. Got the oh I see you paid for those but nothing I can do when I called. Did get refund plus 5000 miles. but quite unhappy about it. This was BCN to ATL leg. I had purchased ultra low fare during a sale (PSC-BCN for 405.00, then later paid for the EC upgrade). This was the second change, the first due to equipment or time, moved me from a decent economy to the row with the bathrooms behind me, no recline. Some research concluded that due to my cheap tix, my priority on realigning seating was at the bottom of priority.