They have been calling all day. Did not answer. They did not leave a message. I called back, there was a recording for customer service and I entered my number for their do not call list.

When I answered the phone, the caller hung up.

Called and put my number on the do not call list.  Hope it works.  They have been calling all day.  At least 5 times within 30 minutes.  Never left a message.

how do I place my number on the do not call list.  i have been getting calls from this number 5 to 10 times a day.

This seems to have started recently with quite a few people.  Hopefully after blocking they don't call again.