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The chainset they've tried is probably a Messenger/RD2, so no problem there, due to it having a smaller bolt PCD.
I'd take the partial refund, and either modify the stay with a piece of wood, or return your crank (after all, how did you know it would foul on the frame?) and buy something different.
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It's aluminium. Really wouldn't go ham at it with a piece of wood.
@TurtleRecall Omniums have notoriously fat spiders that have issues clearing a lot of frames. Not sure its strictly 144 specific.
What do you think? Im disappointed.