Vivo phone

I walked into a Game store to purchase a phone. I was approached by a man promoting the Vivo phones. He claimed that the Vivo y1s was an exceptionally good phone and better than Samsung. So I bought it. Not long after I realised that I can't get WhatsApp messages or phone calls when I'm in another app and the phone freezes. I went back to Game asking if there could help me with the problems I was experiencing with the phone, to which they rep**** in the negative given the fact the the phone is manufactured that way. What a waste of money and time. A very frustrating phone brand to buy, not workable at all. The Vivo y1s has reviews written online that it competes with the I phone 6 and Samsung A02s.. All lies. It's far from those benchmarks.