More than a month and no refund!

I purchased batteries from Deltec in December 2023. I changed my order and was told that the refund for the amount will be made via eft to my bank account. So at the beginning of January 2024 I followed up on the refund and was told only then I needed to complete forms for the refund. This has now been a month and no refund has been made and numerous emails and saying the payment will be made. I tried to be considering but this is now getting suspicious.