Short code scams are rife. You receive a text message from an unknown source informing you that you have been opted-in or signed-up to some such service, or you receive an unsolicited text message asking you to reply to this short code.
Your best bet is to delete and ignore them.
Short code scams work by tricking you into responding. Either by messaging the short code or by supplying personal data. The former results in you being charged for a premium service, either one time or repeatedly, and the latter by trying to elicit data such as usernames, passwords, and PIN codes from you, known as smishing.
You can look up short codes at https://www.shortcodes.org/ to see if they are a scam. Although to be honest if you did not initiate or request the message your best bet is just to delete it and not reply or click on any links it may contain. Also flag it as spam if your phone provider offers this service.