Unhappy customer

I bought a Lenovo tablet from Sahara . The tablet was giving me a problem since from day one I bought it..<br> Tablet is very slowly . MY tablet went to Part Serve on the 17 -11 -2015. Unit is still under 30 days DOA (Swopped period) Now Part Serrve has requested permission to reload SOFTWARE. And they said If this resolves the problem there will be a quote of R425-00.However if the unit is still not working it will be treated as a D.O.A.<br> <br> It seems as if the agent is not sure if its software.<br> Why they saying if my unit is not working after loading SOFTWARE they will treat it as DOA?<br> I need this unit credited or swopped please.I can not pay for software i never removed.<br> Why i have to pay for the SOFTWARE to be re installed for the agent to determine if my unit is faulty or not?<br> <br> I need someone to call me ASAP.Serial no. of my unit is 1S***2HJH0D08P<br>