spam mesages

Please contact your cellular carrier and explain your problem.

If it is a scam attempt (not just spam), learn what to do by reading this article:--> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Regards

Giulio

Open Settings ➢ Messages, then turn off MMS Messaging for a few days, then turn it back on.

In the meantime, the spammers will see their alerts that your number is no longer accepting their spam.