Gionee Communication Equipment — gionee a1 lite replacement/repair

Address:

Mumbai City, Maharashtra, 400064

Hi,
I had purchased gionee a1 lite from flipkart for my sister on 23rd march 2018, but did not opened the box till 16th may 2018 due to exams of my sister.
On opening the box and using the handset for almost half an hour (Have not yet inserted sim card), phone started to switch off and switch on its own. I had tried factory reset, software update, but yet the problem persisted. On submitting the handset to the service centre, they said its a motherboard issue and new mother would have to be installed. I insisted on replacement for the peice rather than repair, as the handset was defective out of the box and i have yet not activated the phone, and according to gionee company policy if there is company defect within 30 days of activation of the model (And my handset is still not activated), i am in my rights to demand for replacement rather than repairs.
But the service guy insisted if i had purchased from normal shop, then replacement would have been the priority, but as i had purchased from flipkart, i am not eligible for replacement. I did not found a sound logic behind this, the handset is made and sold by gionee, then why the manufacturing defect policy changes if i purchase from flipkart?

Please look onto the matter and issue a replacement.