same thins happened to me
text said "Heyyy Lizzie"
I wrote back and told them to never call or text my number again or I would report it to the police.
Got a reply that said "oh no I have no reception ;("
i texted back again telling the person not to ever call or text the number again, except i worded it a bit more strongly this time.
I plan to block the number and report it to the police.