Wont stop calling and wont leave a message

Has called 10 times in 24 hrs 9 15 am to 900pm WTF

Calls a few times a day, when answered here is how the convo goes:
Caller:"Hello, is Bob there?"
Me:"There isn't a Bob here"
Caller:"Oh I'm sooo sorry, I was just making a courtesy call about the current sweepstakes going on for Visa and Mastercard?"
Me:"No thanks I wouldn't like to enter."
Caller:"Well....*at this point they go into a rather long stream of information concerning the credit card/sweepstakes, they it spit out the info rather fast so you gotta give them some credit there*"

At this point I tell them that I'm not interested again and ask that they do not call me, at which point they flat out lie and say that they have never called my number before even though it has been pretty clearly the same woman both times I have picked up.

If I figure out who or what company this is I will post again with more info.

NON stop every few hours call leave no message. I called back from cell phone once and they said please hold the line someone would be with me shortly. I called from a land line then and the call wont go through.

Calls multiple times daily. When answered, no one there . If ignored, will ring one to five times. When called back,got "please wait for next representative"