I'ts the same here! I get 12 to 15 calls a day from these numbers. 408-264-2763 and sometimes they use the 408-264-2636. I noticed they usually change a digit on the last four. But always a 408-264-2xxx numbers that I deleted. Either way, they never leave a message and in two days I get 50 missed calls on my answering machine. It's starts at just after 8am to about 8 or 9 pm daily.
Same story as the last few. Spam/Robo call. Two so far today on my cell phone.
Received a few dozen calls over the past week during "regular" business hours.
Considering it is from multiple 408-266 numbers, it is not a person. I get the same everyday. It is either a system bug, which phone companies should fix or someone is planning to sell something to stop it!!!