This is one lottery you don't want to play and win. The only way not to win is not to play to begin with and if you have already gotten the shot don't double down on stupid by getting the boosters. As soon as you realise that you have been scammed admit it and don't make the same mistake again. Just because you feel fine doesn't mean you will continue to feel fine by getting the boosters. You are just tempting fate. It's like engaging in dangerous behaviour that could lead to death or injury but you escaped unscathed this time around. Keep doing it and your luck will run out.