Looking at last month's usage report I see 37 calls to Nomorobo's toll free number, each of which "cost" me one minute of my 250 minute monthly allowance. I never directly dialed their number and, actually, it seems to me like Nomorobo blocks a couple of calls per day - so 37 feels low. Is this how it works for everyone.
Here's some correspondence between me and Nomorobo:
My phone service, ATT Uverse VOIP, allows me 250 minutes of calls per month for a flat rate. I noticed that in a recent month the 37 calls intercepted by Nomorobo resulted in a "charge" of 37 minutes against my monthly allowance. In other words, my bill shows that I called Nomorobo (18667326185) 37 times and I'm wondering if, to your knowledge, other phone companies account for calls intercepted by Nomorobo this same way.
Oh wow. No, I'm not aware of any other phone company that charges like that. It's a toll-free number so, no matter what, it should be a free call. There's definitely something wrong on AT&T's end.
The best answer that I can give you is to call AT&T and ask them what's going on.