Block spam messages (sms)

Since about half a year now I’ve been receiving spam messages (in the Messages app on my iPhone) from an online gambling site that I never signed up for. This bot doesn’t have a system that stops the messages when you reply “STOP” or alike, instead it tells you to “change settings”. Since I’ve never made an account on this site I cannot change my SMS settings. I’ve tried doing a number of things to block the sender, but nothing worked for me so far. Do iPhones have a way of blocking unwanted messages like these? It’s getting really annoying at this point