GoAir — Fraud in fare and pricing

I booked a ticket in you goair from ranchi to delhi on dated 18 sep 2020, pnr is zyvq6d. The flight was cancelled by you and said its preserve till the next 1 year please manage your booking via your website and app.
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I managed to booking as per your instruction by mail and checked for next day flight which difference of fare is approx 834/- require by you. I paid and you sent confirmation mail with a seat number.

Now you mail suddenly that balance due is 1579, what is hell, what you want, why this.

Flight canceled by you. Mail sent by you.
Need a full amount refund till tomorrow and need confirmation mail by you till tomorrow.

Need solution