Block it. And seriously, report this as stalking to your local LE and also with your phone company.
For a cell phone, some already have call blocking, if not, there are free apps on the web that will work for some. You can google this. If you have a smart phone, there is a free app called call control. Iphones appear to have apps also. Another one is called Mr. Number.
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
He's doing the same thing to me. With the 330- 502-3877 number. I seriously feel threatened for my life. This guy is crazy. Told me his last name was Mitchell. Wish I would've seen this sooner!