This number has been calling my cell phone 1-2 times a day for at least 3 weeks.  How do I make them stop??

I phoned the # back and after asking for English/French selection, the automated menu asked if I wanted to add my phone number to the "Do not call" list to select menu option #1 and after confirming the phone number I typed in, it told me it would take up to 30 days to remove my number from the call list.The company recording identified itself as:Canadian Premier Life & Legacy General Insurance

Called claiming they were from CIBC and then tried to get private information from me.  I said I didn't feel comfortable giving out any information to a random caller claiming to be my bank and ended the phonecall.  They still call frequently, though, never leaving messages.  They are bastards.

Called several times and didn't leave message. So annoying.

He claimed to be calling from CIBC offering me some kind of credit card. ?This is not really CIBC since this bank do not offer cards to their customer this way.

I am fed up paying for a private number and getting this call 3 times a day.
Will look into legal action if this does not stop immediately, I have a very sick person living here and it is interupting their life very negatively.