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With that said ... some phones allow you to send a Contact straight to voice mail. If your phone has that capability, set a new Contact with the number you want blocked and then set the Contact to go straight to voice mail. I don't know if your particular phone has that capability or not.
Another method is to log into your on-line MyVerizon account (www.verizonwireless.com) from your computer. Look under I Want To, then Plan and click on Block Calls and Messages. If appropriate, choose the phone line from the list at the top or click the check box next to Apply to All Eligible Lines at the bottom. You can enter up to five numbers that you want blocked; enter the number(s) and click Submit. The numbers will be blocked for 90 days, at which time you can re-enter them.
Another option is to sign up for Usage Controls, but that Verizon service costs $4.99 a month.
There also are apps on Google Play that can help, and you may want to search this forum for suggestions because several have been mentioned, but I can't recommend any because I haven't tried any of them.
Hope that helps.