It's Computer Discount Warehouse (CDW) and they're an IT supplier.
The call type was actually a legit sales call. They called me because my name/number was in their records from a prior job where I was involved with buying IT equipment on behalf of customers of the consulting company I was working for.
AFAIK they're totally legit and probably have your name/number from having ordered something from them in the past, maybe for your company.