This is under investigation. We are reporting each of these to our Dell Legal team. Our Customer Care Liaison (DELL-Lorna M) responded to a similar complaint on this thread. Follow the advice that she posted.
I just got a call on my cell phone from someone with a foreign accent who knew my name and said he was from Dell, and that over the last few weeks they have been getting reports from my Dell computer that there is a problem.  Was Dell hacked and customer information stolen??  There is no other way the person would have my name, cell phone # and know I had a Dell computer if it didn't come from your company.  What are you doing about that?  It doesn't seem that you are protecting your customers' identities and that someone hacked into your system and stole our information.  This is pretty scary, especially since you claim to be able to protect our PCs but if you can't even seem to protect our info on your servers how can we ever trust this company again??
Dell Hacked