I still have the texts. I added the numbers to my blocked list.
And I responded once after a few had been received and let them know they were unwelcome and erroneous. they responded and said their list was good. I continued to receive at least one more text.
Don’t know if they continued sending to my number after I blocked them.
If you have the number, you can do a reverse phone number look-up search and see what turns up.