HappyEasyGo — happy easy go flight booking amount deducted but ticket not received

I booked a ticket on 15/5/19 from dubai to delhi for 28/8/19.

After the payment was done successfully it started showing in there portal as ticket booked in upcoming flight section and amount was deducted,

After 5-6 hours i received a mail from happygoeasy asking me to pay more as ticket price has no increased after almost 5-6 hrs of booking ticket, according to them for which i am responsible.

I have mailed twice mails to happy easy go customer care and have called almost 10 times but they are just not responding to mails and in calls.

The time when i booked ticked from this site, i remember the price of this flight was almost same in cheapflight as well as go ibio.

Kindly solve the issue