Apple India — about replace handset iphone 6s

Address:

Mumbai City, Maharashtra, 400042

I submitted iphone 6s at authorised centre maple, mulund west for technical issue and they gave me new handset as mobile was under warranty while checking it is understood that they gave me refurbished handset, as there is some marks on the top.
Expecting new handset but apple is denying to give new one.
As per their policy if handset is faulty in warranty, apple will give replacement i. E new handset