I have had spectacular stats at some casinos well under 50% RTP I get pissed off but wouldn't dream of charging back. I just stay away from that casino for a while. It's true that some casinos have a problem with lag but I don't think that changes the overall outcome of the games. I am not an expert or anything but I believe that is how it works. If you do a chargeback which is a really bad idea that will land you very quickly on a blacklist and you may have problems playing in the future. Not to mention a chargeback for a trivial reason will get you banned from this forum and rightfully so. Sorry you had a horrible session but that is how it goes sometimes.
Someone intelligent, who can actually write a piece of advice without any "cocky comments" in, thank you sir. Unlike the other clowns here.