Swiss pairs, MPs -> VPs
1♣ was a phony club, denying a five-card suit, "could be as short as none" (I think they meant "one")
2♣ was not alerted
Result: 3♠(W)-2, NS+100
I was called at the end of play. North had intended her 2♣ bid to be an unassuming cue-bid, showing a decent heart raise unrelated to the club suit. South had not interpreted it as such, in fact, he seemed not to have even heard of an unassuming cue-bid. EW maintained that if they had been aware that 2♣ might have been artifial, they might have reached a club contract. NS are well known to each other, but not a regular partnership.
How should the TD rule?