In that case they probably shouldn't have called it. I'm not sure why you mention legal, what exactly are you accusing them of? Breach of contract is civil law and if you won, damages are limited to the amount you can show you lost by the breach. It's unlikely you'd get awarded costs for what the magistrate would feel is a trivial case.
If you wanted to use this as an excuse to break the contract, you'd probably be on better ground. If you breach, I don't think they'd persue a claim once they heard your reason.
ofc, IANAL