Having the same problem.  I received several emails asking me to verify my network which I did.  Then finally received an email about two weeks ago saying that the network was verified and that I should expect an email from shipping@meraki.com with the licenses, but that they had been auto-renewed.  Two days from expiration, no email and they hadn't been renewed.  Emailed promorenewals@meraki.com, got the automated response that was useless.  Emailed licensing@meraki.com, and got virtually the same automated email.  So I opened a case.  A day later, the only update to the case was the same contents of the automated email saying "you should be auto-renewed" and reach out to promorenewals@meraki.com if they haven't been renewed in a week.  Then the case was closed.  Opened it again, same response, then closed again.  So I opened another case, same thing happened.  The third time I re-opened it, I asked that it not be closed and that I wanted someone to actually look into it.  Twelve hours later I finally got a response that said:
Thanks for the update
If the auto renewal does not process automatically you will need to obtain licenses via a different channel.
 
Kind of feels like I got the runaround until the license expired.  If they weren't going to renew the promo licenses, then they shouldn't have back-pedaled their initial statement.  I still have a case open, but I'm not hopeful.  I enjoyed working with Meraki, and I used my promo gear for my home network and for development.  Without it, I'll be looking for another product to recommend.