Reebok India — Reebok shoes- size is odd hurts feet

Address:

Lucknow

I have purchased a reebok shoes in last dec'20, after checking my regular size 8 euro 42 I requested the sales Executive to get me the same. But now after using it sometime now in april I started running on the same shoes and its painting in my toes and fingers. Now I realised I got number 7 not 8. I dont know if I can exchange this product and get the correct size. This is happened even after buying and checking the shoes in reebok store in lucknow.

Please advice.