I know people working in Dell tech support.
I think you should proceed like this, call Dell CS and tell them that you are really frustrated with the service that they have provided and you want to speak to a supervisor right now without wasting any of your time. He/She may try to convice you, but insist for a supervisor. Talk to the Supervisor and tell him that you have been using Dell systems for more than 7 or 8 years now, and you no longer wish to buy/recommend any Dell system because of the horrible recent experiance, and you will also inform about this incident to eveyone at your workplace so that they can alos be aware of this scam, your BIG corporate will also not place any bulk orders(like they used to before) for any systems from Dell in the future. Also inform him that this call is being recorded and you will be going for a direct CLIENT ESCALATION as you have all the records of previous interactions and calls.
If you are not satisfied ask for a manager, also confirm that you are talking to a real manager , not to some other supervisor. Ask them their full names(they can reveal that), but they can not disclose their employee id's. Aske him to give you a follow-up call frequestly to check the status , because you have got many other good things to do in your life than running behind this.
Be cool, dont use any profanity or rude language. Best of luck!