Your post was blank @AnirudhG9341 so the exact nature of your issue/question isn't totally clear.
If you are referring to the one-time activation fee charged when you buy your first membership plan then, no, that doesn't get refunded.
See here:
€12.99 Plan
This €12.99 Plan is only available to new 48 customers who order their 48 SIM and purchase a €12.99 Plan from the 5th April 2022. A one-time activation fee of €12.99 applies with the first plan purchase.
However, if you qualify for this second month free offer then it's the equivalent of getting the activation fee refunded.
If you're referring to something else then you'll need to clarify what it is.
If you need to contact 48 support about this then see the links in my signature below.
