At the very least, I would call the quilter and ask about removing the lines. Is it possible that the quilter used a Frixon pen and cold air brought the lines back? If that is the case, throwing it in a warm dryer 'should' remove the lines. But knowing what implement the quilter used would certainly help finding a solution.
I would also express my disappointment to the quilter. If the person is a professional, the lines would have been removed before your quilt was returned to you.