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My friend is so unfortunate that you got that bad experience but try as much as possible running a network check up and any other things that need to be checked on your system before initiating any game to avoid this from repeating it self, because the mistakes has been done and casino at their own end wouldn't want to bear responsibility for the lost involved. So the point is that you have learned the hard way and ensure it didn't happen again.
According to the OP, they are aware that they are playing using a laggy laptop and in fact they are the one that just keep clicking bet despite it’s not going through due to lags.
It’s not about they didn’t know that they have weak internet connection rather they choose to play for unknown reason despite they are experiencing inconvenience on their game.
No matter how I view it, this is the player fault.