I have received 6 calls in the last 3 days. Definitely annoying, though I just abort the call instead of answering it.

Wyndham Resorts calls about timeshare, (403) 398-1130.  Individual gave name of Debra Linn, Wanted to sign me up for Timeshare informational dinner in Lexington, KY. This number has called many times and does not leave message for obvious reasons.

Caller let it ring and then when I answered there was nothing. Not a dial tone, nothing. I tried reverse lookup but nothing. Who is it?

They have been calling me once everyday and not leaving a message.  I'm glad I looked it up to find out who it really is.

continual call with silent response when I answer.