I had a random wrong-number text about 2 years ago from some woman calling me a baby fucker. I replied that it was a wrong number and she profusely apologized. I saved the number in my phone under BabyFucker and send her periodic vulgar text messages -like, once every six months. She gets a kick out of it.
Rick rolling would be a great idea, but I think the joke would be lost on him, he seems to be one of those Jersey Shore dudes and he might take it as a hint to never give up.
Send him sexy texts and string him along.