Canadian Mr Sweeper Inc

My father recently died. While looking through some of this papers I found a receipt for the purchase of a vacuum cleaner (Vortech Force) for $2462.40 from Canadian Mr. Sweeper Inc. in 2001. My mother remembers buying it from a door-to-door salesperson. When I asked my mother about it, she was not willing to discuss the issue. I found out that there was a great deal of pressure put on my parents and that she did not want to buy the appliance but finally agreed. My father suffered from a brain dysfunction caused by an aneurysm years before and my mother was and is partly blind (both were in their late 70's at the time). The vacuum still works and I guess it performs as well as many cheaper brands but I wonder why this company would use such tactics to sell to prey on those who may have been too nice to refuse.