eSIM Booking Refund Still Missing After Failed Activation

I purchased an eSIM through eSIM Booking on November 22 for use in Serbia. I paid €4.50 for the package, but the eSIM never activated and I was unable to use the service.

I received an error message during activation, so I contacted eSIM Booking and was told that I would receive a refund. However, no refund has been issued since then, and I have not been given any information about when the refund would be processed or how I could track it. In addition, even though my messages appear to have been read, I have not received any response.

I have been waiting for a refund of the €4.50 I paid since November 22. I request that this issue be resolved and that my refund be processed as soon as possible.