Some company saying they can help with my debt, they call over and over. I have no debt!!!

I received calls from this number and apparently Global credit...there are different categorical there that helps different company's...I told them that I already went bankrupt (discharged in July 2011) so I do not have debts to pay!!! To take my number off the list and they do not...I contacted my trustee and they told me to call back and ask for a supervisor and to give the supervisor my name and that I had my number recently changed and let them know if the calls still continue that I will be calling the police to have them charge for harassment...

I received several calls for somebody else from this number.  
When I called back, I found out that it was a collection agency called Global Credit & Collection.  
I found there website ( http://www.globalcollection.net/Consumers.aspx ) and contacted their main number.
They told me that they would remove my phone number from their files, and they did.

They phone me twice a day. They even woke me up in the morning. I'm sick and tired of these scammers. I don't answer it because it says its from united states and i'm located in canada.

A recording that said press 1 if you received the file we sent you, press 2 if you did not.  Obviously pressing 2 will lead somewhere i don't want to go or sign me up for something so i hung up.