Rude and Intrusive

This company called me today demanding payment for a bill.  To say they are demanding and rude is a severe understatement.  They were asking for information on my personal finances (income, bills, if I had a mortgage, car payment, cable or dish) I told them that it was none of their business.  They claimed they needed it to create a monthly budget for me.  I told them I don't need a budget from them - I know how much I can afford to pay on this old bill.  I told them what I could pay and asked for an address to send payment - which they never would provide! Instead they insisted they needed my banking info!  I told them they must be out of their minds to think I was going to give them that kind of information! I could not even get them to really identify what company they we with!  When I refused to give them information they demanded payment in full immediately by credit card.  I told I would never give them a dime and would contact thier supposed "client" about my bill.  I think this place is a scam who gets debt information from public records and tries to bully people into giving them money!  As a single parent I have fell on hard times before and have had bills go to collections - but have NEVER encountered anything like this before!