How to block someone from calling/texting me on an iPhone 4s with prepaid service?

I contacted my prepaid store and they said they can't do anything but advised me to look up an app called "iBlacklist". I looked it up in the app store and it's 99cents but has bad reviews. What else can I do? Should I check online for a service? My phone is a Verizon phone, but since my service is not with them, they can't help. Also, the phone is not jailbroken.

Jailbreak it and install blacklist.best outcome and deffinitley worth it

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