Person just called and it's annoying as f! (from BC, Canada)

Voicemail message from woman says she is with NES(? - could not really understand the company name).  She needed for me to call her office today, left a callback number I did not write down.  I have also gotten several calls from 305-356-9999, did not know there might be a connection.

I've received 4 calls from this person last night after 1am and then 2 calls today.  Only one of the calls showed the number, all the rest were Unknown.  The caller sounds like an asian women.  No idea what she is saying.  I just told her to stop calling.

Called us at 8:43pm on May 18, 2010.  My wife answered and they said that they were conducting a survey and asked to speak to the "Man of the house."  When she said I was busy, they responded "doin' it, huh?"It's a waste of people.

This telemarketer is a real winner.  He called to sell me pharmaceutical drugs over the phone with a fake number as the caller ID.  He could barley speak English. He had a thick East Indian Accent. And started curse at me when I would not give him my credit card number.  People like him have been calling my cell phone for over a year and no mater what I do they will not stop. Please tell me who is fool enough to give this idiot there credit card number?

Same happened to me. Someonefrom this number called twice and there was no one on the line. I called back and it was a nonexistent number??? The question is, what can we do about it???