Cheapest back panel

[Itsdebby]

I recently bought m31 ocean blue varient 

After 20 days today i noticed color of back panel started fading

I have used many mobiles in past with same polycarb back like redmi , realme all i didn'T faced any issue like this before

Even i am using a flip cover

Really disappointed

[Itsdebby]

side

[vishal5685]

very bad