Blocked caller keeps getting unblocked
Hello,
I want to stop receiving spam messages from a caller. I tap info on his/her profile and then I tap Block this Caller and then Block Contact so that the command in the menu becomes Unblock this Caller. However, when I close the Messages app and open it again, the command has turned back to Block this Caller. I have restarted my iphone and have also made sure that it is updated. There is no telephone number in the caller's profile so I cannot add it to the Blocked Contacts in Messages Settings.
What can I do? Is there an effective way to stop receiving these spam messages?
Thank you in advance.
iPhone SE, iOS 16