Re-freeview box.The box worked but it was a crap picture and could not ajust. This got my wife very upset so I pack the box up and took it back.!help

:-xI purchased a Huma Foxsat HDRS from comet middlebrook Bolton on 20th.September 2012 and took it back on 22nd.September 2012 because it was not suitable. The manager not the pleasentest of people said that they would not take the box back because it had been plugged in. I cannot afford to let £219 sit in a box,cannot afford to waste so much money has both my wife and I are in our seventies.!HELP