Root - Reject calls and sms ?

Hi
Nexus 5 5.1.1 stock rooted.

Is there any app that can block, drop or reject a call without it going to VM for specific numbers ?
also block sms messages from specific numbers.

Ideally I'd like to be able to blacklist using wildcards and full numbers.

I've found plenty of apps that work, but when the block the caller I end up with the call going to VM and I get lots of junk voicemail messages.

Thanks