Yes - understand that - the minute that's sat on then either the bolts will bend or the pan would crack the way it is.According to the plumber the packing at the bottom is to prevent possible cracking up above at the mount points later on if the bottom sits out from the wall.
All things being equal and if the wall etc is pretty vertical then (edit) again the only thing that can be out is the frame or the bolts/fixings. That then comes back to the frame needs to be squared to sort it out.
It's unacceptable the way it is and cannot be left being packed out. Its a real screw up by whoever fitted the frame and should have been checked for both levels before final fixing. Whoever that is needs to take it on the chin IMO and get it corrected.
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