That usually happens to me when I put my bets on suspicious online casinos. You should've looked before doing that on the license(it should be on the website somewhere). If the license is from Curacao, the online casino is probably a scam. People are usually careful about Curacao licenses since they know they can be scams. Curaçao also does not help players resolve disputes with its casinos. As a result, Curaçao casinos can sometimes steal players' money and disappear. Anyways, you got the ideas. If you want to bet on a legit website, look here
https://globalcsgo.com/csgo-gambling-sites/.