The my boss at the LQS where I work one day a week would faint dead away if we treated our customers that way if you were a weekly shopper or yearly - we have sent people fabric if they call and say we miss cut... make sure when you write to the better business buerau you carbon copy the shop... they need to know they were reported - that may help them change their tune!
I absolutely do not mind if you ask me to check my measurements or my calculations... I am human and I make mistakes - I will sleep better knowing that I did it right.
Please share the name of the shop cause there are enough good shops out there that the rest of us can avoid them...