No refund given from them for a product I canceled

I placed an order for a laptop battery in June, I confirmed 2 days later that there was no stock until end July 2022 so I asked for a refund, no issues. They just will not refund me, it's been a string of 33 emails, Facebook messages, phone calls to get my money back. This is 4 weeks later and they seem to refuse to deal with the situation with seriousness. I've even CC'd the CEO in who hasn't helped at all