Ola Cabs — Non receipt of promotional voucher

Address:	Kolkata, West Bengal, 70039
Website:	olacabs

I got a promotional sms from Ola stating that if I ll take 5 rides within a stipulated time period they will give a voucher worth ₹10000 .when I enquired through mail they asked me to send screenshot of that sms.I mailed the screen shot but they didn't reply after dt.I have sent so many reminder mail but no one is responding.