For text messages: forwarding any text message spam you get to the short code “7726,” which spells “spam” on most phones, to alert your network operator to the abuse. ATT won't accept 7726 But they will accept BLOCK and return a message that the web site is blocked. forward the texts to 7726 or BLOCK, depending on your phone carrier.
http://www.att.com/esupport/article.jsp?sid=KB115812
It did the same to me it said " Yo Olivia a girl was talking about you on ..." then it would have the link to the app. I think they got the name from my insta or one of my other apps. Cuz I used to use y0.0livia as my username a lot and, it's pretty similar to how they spelt it.