I am sorry he is trying to scam money out of you as well. I found this post when looking for ways to defend myself against Ethan Carl Kramer's business fraud. Please let me know if you were able to get any acceptable remedy out of him.
I bought the exhange service, sent my SID in, got one back that had 5 lines go out in 3 days after recieving it. He said it is normal for that to happen. He then said that the unit I sent in was previously attempted to get fixed and it rendered it a useless unit, which really meant the new unit in my car was costing me $275. When I confronted him about he gave a bunch of nonsense and treated me like a complete ###. I had him send my original unit back and cancel the whole deal, almost out of it I thought. No, turns out Ethan doesn't even know which unit I sent to him originally and returned a completely wrong unit to me.
Which got me thinking, if he doesn't even know what unit is mine, how can he possibly know that mine was useless? Reads SCAM and FRAUD clear as day. I am at the point of processing legal action against Ethan and would love to be able to shut this guy down with you.