The Terrible S7

I just bought a S7 it was the worst mistake of my life. I spent days in the Samsung stores and no one can fix my connectivity problems, emails, bbm, Facebook all don't work properly. Reloaded software, upgraded software, format phone, checked with my service provider, swapped Sims, changed network and still the ******* S7 refuses to work. & Samsung stores and repair centres pretend that nothing is wrong with the cell & hope I don't come back to the so called technicians. I wish I kept my blackberry....