Etihad Airways complaint: No refund for cancelled flight

My complaint is about Etihad not refunding me for a cancelled flight after over 2 months of requesting a refund (030422) and sending the full new bank details for reimbursement (230422). No bank transfer arrived yet and only an expired voucher (valid only for one day from 2406 to 250622).

I had initially a booking to travel roundtrip from Brussels to Bangkok via Etihad for the 010520 to 100520 (reservation: UYDCAR), paid entirely by credit card. Flight was cancelled because of Covid. On the 010620, i received a travel bank refund (voucher of 495,41 EUR 54 EUR) valid for 365 days.
On the 250521, i used all my travel bank credit (voucher of 549,41 EUR) and additional amount paid by card for fare difference of 149,4 EUR to buy a new ticket for the 07 to 18 april 2022 (reservation: VFYRYA).
On 201221 i received an email saying one leg of the flight was cancelled and i got the option to request a refund.

I sent a refund request via email (030422) and full new bank details on the 230422 and no official reply, only via messenger after insisting. They said i was going to get refunded in the original means of payment, meaning 549,41 EUR on voucher and 149,15 EUR via bank transfer.

On the 240622, i got an email saying i have a voucher again for 549,41 EUR but no clear message saying until when it is valid, they answered me today (270622) via email saying that i have no credit. The voucher of 549,41 EUR was only valid for one day until 250622.
Until now i received no bank transfer for the 149,15 EUR they claimed to reimburse and a voucher that expired (only valid for one day).