Actually, that's not true, the option to block a specific number is only if you PAY FOR THE SERVICE. I pay you almost 200.00/month. I'm not going to add more on. 

This service is absolutely useless.  It has blocked a total of 2 calls for me in the last 3 weeks. However, I have received dozens of spam calls.

So I just block them through the "block" feature on the iPhone. It's much more useful and I know that any specific number will never get through again. On top of that, I don't have to pay additonal money for it.

All the nickel and diming that ALL the companies do, really adds up and I'm trying to save money, not spend more of it for something useless.