The messages app on my note8 has no "report spam" on the options menu. I tried to forward it to "7726". It gives me the "select recipients" entry box. Typing the number 7726 does not match anyone in my address book, so it does not give me the send button. I click the "+" icon like I am adding a second recipient. I don't add them, I just press "DONE" It brings up something like a "subject" box, but unlabeled and and added "Fwd: " in that box. I click the x box to kill this. Now finally I get the send Icon and I send the message. I check the main messages page, sure enough it is sent. I wait for the promised response from Verizon in item "c" in your solution. Nothing ever comes back. Silence from verizon, as others have reported when they have attempted this. Something is broken.
So the person sending the spam is in NJ. The phone number that shows up on the text comes from my area code. Why does Verizon still allow spoofing?