Is there a away to block text message apps on iPhone 5 with AT&T?

I've been getting people harassing me for over a year and I block the numbers and then they text back a week later with a new number. Is there an app or a way I can block text message apps like pinger and text free from texting me? I've even changed my number and they have gotten my number still. Anything will help thank you.

Do you post your number in social networks? They can get personal information there.

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