Don't know anyone from Monrovia. No message. Blocked

Caller ID said Monrovia. No voice on the other end. No message,  BLOCKED !

Received a call today, Sunday, 4/9 @ 11:47 AM, didn't answer and blocked the number. I called the number back and if you listen to the entire message, and hit 1, you can get "customer service". The "CS" person identifies the company as American Air Advisors.  I get calls from them all the time but from different telephones from Monrovia, CA.  So I call them back several times just to annoyed them so they can understand how annoying they are. Who would trust cold calls?

Jenny the customer service person is very defensive if you ask why they keep calling.  Clearly she doesn't have a thought about what she is doing.

Received a call and I don't answer calls from unknown callers and will block the telephone number.  However this time, I wanted more information, I listened the recorded message and push 1 for customer service, Jenny answered (if that is her name), she claims they don't use different numbers and wanted people to know about their promotion.  Seriously who would trust you?  The company name is not found on google and they call from different numbers from Monrovia.