Go Air Airlines - Fraud was done by Go Airline

I have book my ticket GoAir from Varanasi to Delhi on *th of July and Delhi to Varanasi on **th of July onword, when I am doing web check in, both of flight show date of **th July, then forcefully they rescheduled my flight on **th July while I have very important meeting on **th.
Finally air line cancel my ticket now they did not return my money, they send voucher that I can book flight in future but I do not want.