Ford motor company Sold me a piece of garbage

I have been trying to get my Ford F-250 super duty 4x4 with a 5.4 l motor fixed because my battery goes completely dead after 3 days of not using it. I bought a brand new battery put in a brand new alternator and still the same problem. Ford doesn't even know how to fix it? it's been in the shop over a dozen times and the cost is getting unreal. When they tell me there's no problem?

well obviously there is a problem if the battery goes dead every 3 days if you don't drive it everyday this is getting to be really ridiculous that even Ford motor company cannot fix the problem. I looked it up and others have the same issues that I do which only means that Ford builds crappy vehicles that will give you nothing but headaches do yourself a favor bye another make (don't buy a Ford).

https://www.cargurus.com/Cars/Discussion-t20162_ds513042