Myntra's unethical advertising of Rs 500/1000 credits

For nearly 2months now, Myntra has been advertising that it gives Rs 250-1000 on signup, to be applied against the first purchase. However, the fineprint is that the coupons are split into two, valid only on a minimum order size AND expire very early. Below is the description reproduced from their site
Register with Myntra to instantly earn Rs 500. This will be added to your Mynt Club account as two credits of Rs 250 each, valid for 2 days, on purchases of Rs 1,000 and above. Alternatively, you could register with Myntra using "Connect with Facebook" option, and instantly earn Rs.500. This will be added to your Mynt Club account as two credits of Rs 250 each, valid for 2 days and on purchases of Rs 1,000 and above. Please note that you would be getting the benefit based on the method you use to sign up on Myntra for the first time. 

I understand that retailers must make a profit, but having such deceptive advertising when they are otherwise so transparent(returns, pricing, shipping) is baffling to me. The Rs 1250 credits on introducing a customer, works in a similar fashion as well.