Reply To: Telemarketers Should ASSUR Due to Something

Genevas daas- because often they mask their number and have you think it’s someone else so that you pick up.
Bittul zman (and or gezel shena)- self apparent, phone ringing wakes you up and you don’t want to be woken up even if “the gates of shamayim are closing” (to quote one of the telemarketers). Bittul zman for the same reason.