Bonus not credited casino WinSpin

I signed up at WinSpin Casino and selected the welcome bonus for my first deposit. I made the deposit, received the bonus, played the slots, managed to win a bit, and submitted a withdrawal request. The next day, I decided to make a second deposit and selected the second-deposit bonus. I made the deposit; the casino system confirmed my selection, and I received an automated message, but the bonus was not credited to my account. I tried to contact support, but the site's live chat wasn't working. I waited a while, but the bonus still didn't appear. I played the slots and submitted a withdrawal request. Today, I saw that the live chat was working, so I asked why the bonus hadn't been credited. The agent claimed I hadn't activated it. I sent them a screenshot from the site showing the automated message confirming I had activated the bonus and asked them to credit it. Support refused, insisting that I hadn't activated the bonus. That isn't true! I ask that this matter be investigated and that I be helped to receive the bonus I am entitled to.