You will need to go into more detail by what you mean by only one satellite downloaded? Also, not many receivers made these days have a manual that come with them, it so, it is a pamphlet of some sort that don't really tell you anything.
By great team, I mean they answer quick and I get good help from them. Not sure what is going on with your situation, but sorry to hear, unless it is a third party. If it is indeed Amiko, their products(like all FTA receivers) are meant for the European market, where things are way different over there. Here it is a hobby. They don't live here and it may be harder for them to understand your situation.
Sounds like you are pretty sour with it right now, but when you cool off a bit I am curious what you mean by one satellite? And am willing to help you. I have literally sold hundreds of the 4K units and have lots of happy customers. Maybe you got a bad firmware? If you got it from someone in NA, I can assure you they were not an authorized reseller if they treated you like that.
The Amiko Mini 4K units that I sell I have set for every(or just about) satellite from 15 degs W to 177W. I can assure you they do more than one satellite.
What satellite exactly are you trying to receiver mainly or which ones?