Something is definetly off with their casino . 3d day of playing , 3d time I'm encountering problems "bugs" with their slots , basically first 2 situations were on a slot where you can do bonus buys , the winning amount from the bonus buy wasn't added to my balance , and second situation now literally on another slot , got an 8 $ win on a regular spin , they added to my balance only 3 $ .
Something's way off here.
Do you have bets history on your account provided by casino? If no, which provider you were playing? As far as I know, most provider with buy bonus feature has its own bets history. If what you say is true then you can show the bets history and compare it with your balance. The most simple way, you may ask them about your bets log or balance log to check if there is an issue with the game.