I can not use my play store app I want to log in my play store app but it's not letting me log in instead it's asking me redeem your code:
Make sure you have internet connection. Such screen appears when there is no internet connectivity. As I can see from the screenshot, that you are connected to a WiFi, make sure internet is available from that source.

I have recreated the similar situation. Connected my device to a WiFi which has no internet connectivity; Opened Play Store and this is what I got.


Screenshot (click for larger variant)

So, just connect to a stable source of internet and you will be good to go :)