Pre-purchase, online customer support told me that the XPS 9560 came with one 16GB dimm.

Based on this information, I bought the computer and an additional 16GB dimm chip.

Turns out, it came with two 8GB dimm.

I've filled out an online request order support form 3 days ago and I have not been contacted.  How long does this usually take?  How can I follow up to get Dell to contact me?