Xiaomi India — Device not returned from service centre

Address:	Kolkata, West Bengal, 700084
Website:	www.mi.com

Before submitting my device, I had asked them about the average time it would take to repair. They had told me 20 days. So I submitted them my device on 6th August, but still haven't received any update from their end. I told them many times that I'd be leaving for abroad. But still they are not taking it seriously. I'll be in big trouble if I don't get back my device by 4th October.