Srilankan Airlines — Long pending Refund of my ticket

My ticket number[protected]
Name Parvathavardhini mithunakumar
Refund Request number UL/RR128702
booking reference ROA6NX

the above ticket was booked directly with SriLankan Airlines, due to corona and cancellation of flights Airlines was issuing tickets with date changes.
In September 2021 Airlines asked to go for refund request as it cannot issue further date changes. Hence I submitted refund request, details above.
Its been five full months. There was no response for my multiple emails and calls. Only received automated email asking to wait for response. My calls were diverted and kept in waiting for an hour without response.

My request is to either issue refund or issue credit to book my return journey. Alternatively reschedule to different date. They haven't responded to any of it. Since Jan I have emailed them twice and called them twice to let them know about raising a consumer complaint. No response. Kindly help by resolving situation.