Reversible Sleeping Bag \Comforter\or Snuggly

It will make a great comforter. 64x80. It has an issue with the zipper. It's all there but I can't get it to zip up. There are no holes, stains or anything and it is a heavy one. I have no clue why it won't zip any longer. However it is heavy enough to sleep on top of or below it. It would be a...