Reebok India — My shoes got fade or yellowish

Hello Reebok, i am very disappointed actually i purchased shoes zing kinetica of Reebok of mrp 12999 rs. from Reebok store situated in GIP mall Noida Sector 18 Uttar Pradesh.
Now my shoes sole colour turned into yellow colour.
I had tried to clean many times from last 1 year but unable to fix that problem.
First time I saw that problem in Reebok brand i am regular customer of Reebok.
Please try to fix this problem.
Thank you so much