DD, they are probably waiting for the original mal-formed item to be returned first !

a misformed sheet with a considerable number of flaws in the surface

Corrugated Plasticard???

Ron: The postage would cost about the same as the sheet.

Rick: Brick actually.

If I don't hear soon, expect to see a model of a blitzed plastics factory.
… just to make use of the malformed sheet.
I'll send them a picture.

Thats a pity Pete, maybe the molds are getting shook or the operator?
Heavily weathered brickwork maybe fire damaged?
Goodluck, Derek

I don't think they care, Derek.
Their sheets are never cut square and are often malformed in some way.
I've not even had a reply.