If I'm correct, get in touch with returns@merkai.com and provide your RMA number. They'll be able to provide you information on what's required to return the faulty device.
Normally instructions included within the box and are emailed when the RMA is created, check your email chain.
If you're still having issues/No reply from returns@meraki.com, get in touch with support (help>get help) and they'll be able to advise/give you the correct contact details if "returns" doesn't work.
Eliot F | Simplifying IT with Cloud Solutions
Found this helpful? Give me some Kudos! (click on the little up-arrow below)