Xiaomi India — mi 2 in 1 usb cable

Address:

Lucknow, Uttar Pradesh

I have bought mi data cable worth rs 280 on 24th of oct. It is not working properly in my phone. When i connect to it with my phone it shows it is charging my phone but after a short time approx 30 sec it disconnects my phone. I am tired of this. Please tell me how can i exchange it. I have uploaded my invoice.
Please suggest me what should i do???