Royaloak Furniture — Defective product returned but no refund

Ordered a wall mounted study table from RoyalOak order ID ROY0043440 on 15June2020 which was delivered on 19June2020. However the lower side of the desk came off and damaged the side of the desk. Replaced 4 times and all the times a damaged replacement was sent. RoyalOak's vendor Oposal took back the whole desk and agreed to refund the whole amount. After two month, RoyalOak said no refund but we can give any other product with same amount paid for desk. Again after two weeks they say the vendor Oposal has to give the refund as they have taken payment. Oposal agreed to pay 80% and asked RoyalOak to refund rest amount. Shared bank details to both, but nothing happened. Have been following up with RoyalOak and Oposal for the past 8 months but none of them are now responding. Have all emails of conversations but seeing no end to this.