Your two wks notice would be the two wks holidays. Not four wks all together. U need two wks pay back. You have your contact that she signed to fight it if need be. I'd just say something like " I sought out some legal advice and I am entitled to two wks pay back as my two wks notice counts as your holiday pay on those two wks and it doesn't state otherwise in the contract I have. I'm not wanting to go to small claims court to fight it but that's a lot of money and I am wanting it back" usually just the scare of that scares most of them in giving the $ back. Hoping for the best.