Refund to different card/account

I am due a repayment. Unfortunately, I no longer have access to the card that was used to make (some) of the payments. I partly made the initial payments through this no longer active card, and the rest via bank transfer. However, when I request a refund it seems to make it to the card I no longer use (despite me inputting bank account details). My accountant suggested writing to the HMRC, which I have done twice via recorded delivery - but I have not heard back. I work full time and although I have tried several times on the phone - I always have to give up given the waiting times. The live chat feature also never seems available. Can someone assist?

Hi Omar Saeed,
You can check when you can expect your written requests to be processed and replied to here:
Check when you can expect a reply from HMRC
You can access our webchat service here:
Self Assessment: general enquiries- just click 'ask hmrc online'.
Thank you.