Refurbished laptop sent wrong power adapter

After the warranty expired I had a RAM chip go bad, I took it to a Dell certified technician that replaced the RAM and then asked me if I had had any other problems with the laptop.  I told him about the video card and he also asked if the power adapter that I had brought in was the one that I had received with the unit.  I told them it was, he then explained to me that what Dell had sent me was a two prong non-grounded AC adapter and that I should have received a three prong grounded adapter since the unit was sold in the United States.

The technician then showed me by recording audio on my laptop that there was a 60 Hz hum that was being recorded along with any voice.  He then found that customers laptop that had been left there for repair it was also a 1705 and he took power adapter from it which was a three prong grounded power adapter plugged into my unit and did the recording tests again this time there was no hum.

I have been on the telephone for over four hours today speaking with Dell support people who are obviously not in America, and have no conception of what my issue is.  All they keep telling me is that my system is out of warranty, which I know and that if I want to speak to someone it will cost me $39.95.

I would like to try to find a phone number for Dell that is located here in the United States so that I may speak with someone who can understand what the issue is.  My laptop having been originally sold in Canada where non-grounded AC power is the standard and then having been returned to be refurbished and resold to me in the United States should have had that two-pronged non-grounded adapter removed and a three prong grounded adapter put in its place.

Besides being a fire hazard, a shock hazard, and having the 60 Hz hum can not be good for the laptop itself all I want is to be able to exchange the adapter that was sent to me that is a non-compliant US adapter with a three-pronged adapter that is grounded.  So that I may be able to use my laptop without doing any further damage to it.

My warranty expired in September 2007 and everybody I e-mail at Dell or anybody I can seem to talk to on the telephone keep telling me that my warranty has expired and I realize this, but I feel that this is an issue that predates the sale of the machine to me and should have been caught at the Dell refurbishing center.

So if anyone here, another end-user or a moderator can give me a phone number so that I may speak to someone at Dell who is physically in America who can understand that we use three phase power I would greatly appreciate it.

Thank You
David Brown