They do not respect the Do Not Call list

2 persons names found on internet in strange lookup page www.phonesbook.com that only has about 30 listings.
KUNDAN, DHILLO
KUNDAN, SURINDER

We get constant calls from 415-482-0720 usually with hang-up. Phone id shows "Window Factory". I also did a reverse phone look-up and returned name Surrinder Dhillon  address 41 Brookdale Ave. in San Rafael.  When I try to call the number back it either no one answers or it answers with busy signal.