Double Debit. No refund

I placed an order on Black Friday with adidas. Just imagine, that was November 2024. Adidas double Debited me. I raised this concern in December. They asked me to provide a bank statement which I did. Till today, I have not received my refund. I send emails but no one replies. I phone and they tell me just wait 5 days. This has been going on for almost a month. What do I do?