That's a pretty ridiculous position. You can look at the betting history and if you see thousands of 50 cent spins followed by a single $25 spin - after the player is almost certainly in a position to clear the wagering requirement anyway and immediately contacts chat - it's pretty obvious it was a mistake and not some devious fraudster trying to slip one through. You don't have to give them the $25 back, just don't void all the other winnings.
I'm sure there are some situations where you can't tell - and therefore can't give the benefit of the doubt - but to say there's zero information on a first deposit is absurd. The playing history is literally information. You're absolutely correct that the casinos set rules for a reason, but I swear half the time the casino doesn't even remember what that reason is. Max bet rules can protect the casino from some types of play, but if you apply it in the above hypothetical, you're not using it to protect the casino from being exploited, you're using it as an excuse to screw the player.
With the above said, however, your post is informative in pointing out that a lot of casinos probably think that way, even if in many situations doesn't make any sense.
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Regarding the actual first poster in the thread though, if you've provided an honest summary of the situation that is pretty shitty. They tricked you by saying "we'll make a note of this" - they didn't actual clear it as okay, you should have tried for a more definite answer. Casinomax does have a rep on here, so you should contact the person mentioned in sapit222's post and go from there, but if that doesn't help you're probably screwed since you technically violated a rule - even if it was a clear mistake that didn't give you any advantage.
Regarding the "software glitch," that's not really a glitch, just bad design that it saves your bet size but not number of lines.
Either way, let us know what ends up happening.