iBall — faulty tablet at service center for last 2 months

My iball tablet was given to repair at your service center in dec.
Complaint # [protected]c001

After 15 days, i have been told that parts are not available hence refund will be given.
I had submitted cancelled cheque and invoice for the same.

With that information i had purchased a new tablet.

After one month when i inquired about my refund, they are providing a replacement.

I do not want a replacement now since i already purchased a new tablet based on refund commitment from iball.

I want my refund at the earliest.