In relation to your substantive point, the word "campaign" is meaningless in terms of consumer law. Had Finnair used terminology such as "Sale" or "Discount", these do have specific meanings, and you might be able to try and get some remedy, but this would depend which market you bought the tickets in. In the UK for example, the OFT (Office of Fair Trading) has taken enforcement action against Ryanair for misleading advertising, as has the UK Advertising Standards Authority.
I think this is a case of caveat emptor, but the dynamic pricing used by airlines is so opaque, I think the only real remedy is to not fly with them again.
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