At first, the nature of the call I received seemed to be about payment for a vehicle imponderably linked to my mobile number. The call concluded w/an invitation to remove my number from a list, which Digitcom Services apparently purchased. I dialed the abovementioned number, only to discover that the agent/agency which called me purchases such lists from professional companies/businesses.
I made a recording of a fax modem, when i see them calling, i play that recording into the phone, i think it registers that its a fax/modem line and they stop calling. at least so far that has worked