I booked a group holiday and the price unexpectedly doubled in the last two minutes between the final check and the payment going through. It might have been because everyone was clicking on the link and the algorithm sent the demand pricing higher - I don’t know. I didn’t realise this at time of paying and only noticed when it came to totting up how much each family owed. The booking platform and the vendor have both said I saw the price before I paid and they will not reduce it or partially refund. This is technically true but I would never have purchased it if I’d noticed. Others on the trip don’t want to pay double what we’d agreed, but I also can’t afford to pay double my own family’s share and the rest of theirs. What’s the fairest way of paying me back or do I have to suck up this very expensive mistake?