casino cashback excluded jackpot games after promo page said all slots count

saw a cashback promo, page said “all slots” count toward wagering. played a bunch of regular slots plus some jackpot ones, then support told me jackpot games don’t count for cashback, only the base slots. promo page didn’t mention any exception and i checked the t&cs for game exclusions before playing. feels a bit like they changed the rules after the fact, or expect us to know what “all slots” means isn’t literally all slots.

i’ve seen some casinos pull similar stunts on table games, like counting only some blackjack or roulette versions for wagering. but usually the game lists are clear. has anyone managed to argue this and get cashback honored, or do they just stick to the “software error” excuse? what’s the best move here - push support, or just leave it and take the loss as variance?