Air Vistara — Fraud and sold ticket for the date and location they won't provide services

Address:	New Delhi, Delhi, 110067
Website:	www.airvistara.com/trip

I had booked a Round Trip (Delhi to Varanasi) in Oct-16 for March-11/2017 & March-15/2017 (Air Vistara-UK-831& UK-993). Today, I received a text saying that Vistara are not going to provide service on the above date and location. I had booked the ticket almost 6 months prior considering my schedule and finance. Now, they say they will only refund the amount and tickets for the above date and location are 4 times costly which I can't afford.