Systems does not work and no real support

I purchased a new system consisting of a server i5 8gb but received a i3 4gb. I also purchased 2 touchscreen systems. Besides the incorrect server delivered, the so called just plug into network and it'll work does not. And support!!!! I have to battle along with whatsap as there is no telephonic support. And more, now they want to charge me R950 to assist with something that they said would just work - The 2 touchscreens cannot see the server although the server does see them, thus the system does not function. (Ok, they have said that they will swop server - waiting on that before I can continue) But what about the touchscreens not talking to the server???