Leeco / Leshi Internet Information & Technology — Tv 55'' - no cash back

We ordered LeEco 55" tv on 5th Feb 2017, it was on a offer of cash back Rs.3000/-, they said post 2 months i will receive my cash back . Its already been more than 2 months there has been no response by LeEco customer care team neither there has been any response on my mails . The customer care number is crashed since a week now .No one picks up the calls