If they give you there phone number call it!!!!!  Otherwise email them asap!!

I agree with this. Are there any other creative follow ups that people have? What would you do after your initial call or e-mail back... what if you don't receive an additional response to Your response?  I think it's very important to have great customer service and return requests promptly, but not be pushy...

First, if there is a phone number, call them.  Then, always followup with an email.  If no phone number, send initial email.  In both cases, they should be added to a drip campaign.  Top Producer does them automatically for you.