Did you wash your fabric before you started? If not, it's a
good example, unfortunately for you, but for the rest of us
to wash our fabric before we make our quilts. If you did
wash and iron the fabric before you started, I don't know
what to tell you except maybe remove the backing, since it
is tied, and the batting and go in to reinforce the seams.
Unfortunately, there is no quick solution. I've taken quilts
apart to replace fabric that I did not like. When I started, it
seemed like a major project, and it turned out to be less of a
chore than I thought. I'm sorry this happened, and whatever
solution you choose will be the right one.