Got this call but did not answer.

Called during the workday and left no message.

I received this call with a Missouri area code but my CM Security App labeled it as being from Canada. This is the second such strange call supposedly from Canada, the first was a week ago from the 510 area code (San Fransisco Area). There has never been any messages left.

Called late in evening did not answer

Was waiting for a call back from Verizon Prepaid Phone rep but this number didn't appear to be a Verizon number.
Did not answer first call or second call when they called a second time. May have been Verizon, but I don't want to have a scammer think my number will answer so I'm not answering to that number.