Bad service

I paid up my credit card on 16/08/2024, which was within the 5 days of my closure quote. The credit card was not closed and my instalment also went through. I called their call centre, after being transferred from pillar to post, I decided to send an email. They confirmed that They will close the credit card and refund me as it in credit with the excess amount. I have not been credited. I called again today, my call was put through from pillar to post again without any assistance. This is very bad service. I need my refund ASAP.