I have issue with my travel ticket refund and...

If you have a problem against an airline due to a refusal to refund the value of airline tickets, in that case you can first contact the airline’s customer service department.
If the airline refuses to refund the cost of flight tickets, you can file a complaint with the Consumer Protection Department at the Department of Economic Development.
The documents must be attached to the complaint proving that you paid the value of the tickets.
The complaint will be investigated and the appropriate decision will be issued.