Puzzle Woes...

So I haven't completely finished the puzzle, but I am absolutely certain that at least two, if not more, pieces are missing. What to do? Call the manufacturer and complain? But if I do, will they send me a new one?? HELLO! This one took me over three weeks. Yeah, I really want to do it again. About as much as I want to poke myself in the eye with a sharp stick! So my other alternative is to try to make a 'new' piece and hope it doesn't look totally stupid. Whose idea was it anyway to buy a puzzle to put together for glueing and hanging on my son's wall? *sheepish grin*