How to Block a number on iPhone 5/ Verizon?

For the past week, I have received several calls and text messages from an unknown person, and I don't believe they speak English. If anyone can identify this language, "Polina ze Abba. Titkaski habaita." Please leave in the answers. Anyways, I'm getting annoyed and fed up with this and want to know how I can prevent them from contacting me further. (I will not jailbreak my iPhone)

There are apps that block calls, and Verizon's online customer dashboard (found at "My Verizon") has a page that allows you to block up to five numbers for up to six months for no charge (anything more than five blocked numbers will cost $5 a month).

Install an App, something like Black list and than you can block the calls.