kakahama721 wrote:
well I do it but in case if they dont exchange it to me or not get back as they already said no come back , is there is any guarantine to work for long period like those intended to buy ?? in case forced to keep it
There is no Apple warranty on an iPhone purchased from an unauthorized seller.
That shop is free to offer their own warranty, but since this shop as already told you "no come back", that seems to indicate that you bought a phone without any warranty at all. You will be on the hook for the full cost of repair should it need any service. Assuming that it is eligible for service, and that it's not a phone that an unauthorized shop worked on, in which case Apple and Apple Authorized Service Providers might refuse to offer repair service for it even with you paying the full bill.
I'm sorry, but it sounds like the decision to purchase from this unauthorized seller, who apparently doesn't stand behind their products, wasn't a very good one.