Game bugged and didn't use upgrades from tickets for EX. Used 20 upgrades instead. I requested it be fixed & they reply: "Unfortunately, we sincerely regret to inform you that it is not possible to restore items even if they were exchanged by mistake. In addition, unfortunately, there is currently no option in order to revert the exchange that you performed." Unacceptable. Pay $, game bugs, dev claims "mistakes" and nonreversible and that's supposed to be fun gameplay. Predatory & exploitative.