Revert Electronics- No payment of refund!

We sent our inverter for repairs to Revert Electronics, they attempted the repairs and could not fix the inverter after several failed attempts and purchases of parts. They promised us a refund and they could not repair the machine. Refund was promised on 31st May 2024. Its been two months. We have not received our refund and they are simply ignoring us. Stay away from this company! We should have read the previous reviews....all bad!