im in the same boat. 1 miner not working since 1st start. 3 weeks messaging via mails tickets. they created order. then order complete message get to my mail. & nothing.... not give me tracking number & I dint know item shipped or not.
Wow, well I would keep on them and send an email every couple of days to check on the status. Did they have you send your miner back to them?
in my case, no... the miners are hashing even now, but around 6TH each.
They will send me the PMU(if they will), and i'll have to figure it how to change it (not familiar with 741 insides, but don't think that's rocket sience)
Update: Just got a call from DHL, saying that I have a package from China, company Caanan. I'm waiting for the documents to fill them up..