I also get these calls many times a day.They are scams I get no less than a dozen a day.here are more 828 919 0301....9494475906....828026306391...628 333 6321....202 354 6897,
Unknown caller, identified as an alarm company and then hung up. I received multiple unknown calls from different numbers immediately after answering this one.
Caller ID said "None". When I answered it, a machine said "sorry to keep you holding" or "sorry for the wait" (don't remember exact words), then a man said "Hello" and hung up. I've been on the do not call list for years and still get these bogus calls regularly.