I do agree that if the quilter did see she had a problem with the back you should have been notified. Did she bother to tell you WHAT you did wrong with the back?
If you left selveges on the fabric would cause a problem. Did you have to piece the back? The fabric might have been off grain before you pieced it. There are tons of things that can cause a longarmer absolute fits.
If your longarmer is to busy to check for problems before quilting, then you need to consider using someone else.
The above is just my opinion. I am a longarmer, and if you would like please send me an email to
[email protected] and I'll be glad to give you a quote for quilting.