HappyEasyGo — refund not got even after 10 days

I have a complaint against the site www.happyeasygo.com
I was booking a ticket in indigo airlines on 6th of october'2018 for myself. When i booked the ticket the payment went through and it said my transaction is completed and i will get my confirmed ticket maximum within 45 minutes. After waiting almost 4 hours when i didn't get the confirmed ticket, i called them. They told me that in order to get a confirmed ticket i will have pay some more money as the price increased when i was making the payment.
Problem is i have booked tickets from all travel portals and never have they ever increased the price when we are typing our card number which also was done very quickly.
No where did they mention the price increase nor did they stop the payment.
Usually in such scenarios if fare price increases the page is refreshed we are shown the new price and if we are comfortable with that price we go ahead and make the payment.
As a consumer it is my right that i pay for what i see, and if the price rises also and i see that the increased fare price is the amount to be paid, i can do so, but how can they ask me to pay extra cash just to get my ticket confirmed. They kept blaming indigo saying they increased the price. I told them that if indigo increased their prices when i was making the payment they would have got a mail or notification from indigo about the price rises and that they should send that mail to me so that i am satisfied that it indeed was indigo increasing the price. But they said they have no such proof and i have to go for their word for it. This is completely cheating the consumer cause we don't even know if actually the price did rise. This is hooliganism where they don't process your ticket till you give them extra money. And i didn't even see the price they were asking for. For all i know they kept the ticket on hold, and only once they get the money they demand will they release it.
The ticket fare keeps increasing by the minute and after 4 hours the price will ofcourse be different. They asked me to pay the fare difference between what the fare was 4 hours ago and 4 hours later. They gave me an option to refund the money but seeing how bogus their operations are i was scared to go ahead with that option and instead opted to pay more as booking the tickets was more important for me.
I asked them to refund my money back immediately but they did not refund it till now. Its been 10 days so plz help me getting my refund as soon as possible.