Samsung customer service and problem detection bad

I took my Samsung note 2 in for repairs early in January 2016. The problem was, it dies randomly, looses network connection and does not respond. I received a quote 7 days later stating that the motherboard had to be replaced for the amount of R2 897,97. I thought it might be worth while as it is a good phone and paid the money for repairs. a week later I received the phone back and it would not work as it has a permanent message and would not respond stating \the Samsung Keyboard is not responding\". I gave it straight back and they said it needed a software upgrade. I was send a message 2 days later stating the phone can be collected. I went in and collected the phone late afternoon and took it home. My wife took the phone, put everything together and it would only turn on and off. (Same as before). I took a video of the process and fault, and returned the phone to Samsung smart care the next morning. I could not wait as I had a meeting and left it to be checked after explaining my dismay. 2 days later I got a quote for further repairs to the amount of R 837,44 for SUB and Battery to be replaced due to water liquid damages. Still no phone and quote not accepted as Same issues ??"