Flipkart — Refund for defective Grand Plus Ro

I had bought Grand Plus Ro machine from Flipkart by spending an amount of Rs. 4400. Flipkart had provided me company and service centre details, the company did not respond to my calls or emails. Flipkart said that the refund is being processed and promised that it will be resolved by 31st December 2022, but I have not received the refund yet, they are either closing the issue without actually providing resolution or keeping the issue unresolved. I would like to receive full refund from Flipkart at the earliest.