I can't believe none of you folks have ever sought out compensation from Comair before and don't know how to handle this.
They screwed me over a year and a half ago out of ABE. I missed a class riding a bus to EWR, adding several hours to my destination because of equipment.
Go to this website:
Comair, The Delta Connection Feedback
You can send an e-mail, but I find it more effective to write a letter to the address at the bottom. Send it certified mail if you really want to expedite the process (sorry to use the TSA lingo).
They'll send you a voucher. It'll look like one of those old school credit card receipts with a carbon copy. It probably won't be an e-voucher. (Although, NW's Regional Carrier Pinnacle sent me an e-voucher good on NW once)