Did I just get scammed? Who can I complain to in Oman?

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I need some advice on where to escalate a complaint against an Oman based airline.

I booked a flight directly through their website, paid in OMR with my Omani debit card, and the airline later canceled the flight. After waiting almost two months for the refund, I received about 13 OMR less than I paid.

Customer service says the refund was processed in USD, so I ended up paying the exchange rate and bank fees even though I originally paid in OMR. I've spent the last week going back and forth with their support, repeating my case multiple times, and even a promised manager callback never happened.

Is this normal? If not, who should I file a formal complaint with in Oman?