[Resolved]  Yatra Online / Yatratrip.in — false promise

There is an advertisement on yatra website which says that there is an offer to get almost 20000 off with the code ytintfly. This is a big lie!!!
The code is told invalid even though your booking should be eligible for the offer as per the terms and conditions. I have tried to get this offer with other accounts but still not able to do it. I book a flight from lhr to hyd for 14 september 2019 and return on 29 september 2019. I paid 39k for the tickets including all the charges. I decided to re-schedule the return ticket which was on 29 september to 10 october 2019. On checking the flights in the website, the price of the flight is 21k. I tried to re-schedule it myself from the website but this option is not available with yatra. I called up the number provided on the screen. The agent who answered the call, seems to be lost. He informed that a call back is needed to be arranged to re-schedule the flight. I informed the agent that i have a very strict schedule and hardly get time as i work in night shift. I requested a call back at 11 am and i did receive a call then, the agent mentioned that i need to pay 12k more to get the ticket re-scheduled. I was in sleep and also didn't have that fund in my account i requested a call back again and asked the agent to promise me to call me. Nobody called me and then when i started chatting again, they informed me that i have to pay 14k now. Later at 9:30 pm i called up and requested to re-schedule the flight and they asked me to pay 15k. The price kept on increasing. Yatra keeps advertising that they give the cheapest flights and they help us save money. They are liers!! Just liers!! On cancelling my flight for september 29, that seat becomes free to be booked again. However i am paying for both the flights. I have paying 39k + 15k to get only two tickets?? Is this how customers should be conned? What about situations like mine where in there is an emergency and the flight is needed to be re-scheduled.?? I am requesting the consumer complaints boards to take a look into this please.