Why does my S5 have many problems?

A

AC Question

I have only just bought my Samsung galaxy S5 and it as many problems. For one, on the WiFi settings, my phone doesn't have the overflow button (the 3 dots) in the top right hand corner so I can't turn of smart switch. Also my internal storage has -3040637184.00B space available even though I just bought my phone (my normal phone storage is fine). Finally, my play store looks way different to normal. Whilst everyone else's looks green and white, mine look grey and black and its set out differently. Please help!