Nomorobo is designed to stop annoying robocalls and spam calls from blowing up your phone. All Fusion Voice customers are subscribed to it by default and may opt out by disabling the option "Spam Call Blocking" in Voice Options Member tool. A blocked calling party will receive a standard "We're sorry, the number cannot be completed as dialed" error message.
However, as you mentioned because these numbers were spoofed, this creates another layer of intricacy. When the number is spoofed the caller is deliberately falsifying the information displayed to your caller ID. These individuals often use a local spoofing technique, so it appears that an incoming call is coming from a local number.
In regard to an update to Nomorobo for spoofed calls there are no current updates but any time Sonic can prevent spam and make your customer experience more beneficial we will take steps to do so.