Ewallet reference ID cannot be redistributed after deletion

Hello dear Rapyd Community,

I am currently working on the sandbox mode of Rapyd, and automatically creates Wallets for my users using the API, and a custom referenceID.
During my testing, I tried to remove all the wallets on my rapyd dashboards, to have a reset and try again with new methods.

However I get errors about wallets already existing when creating a new one with an old reference ID, even though I deleted it.

Does someone knows whether this deletion takes some time or if the referenceID is stored and unusable forever ?
I did not find any button in the sandbox mode that allows me to completely reset all of the current Data (similarly to Stripe), is this not possible at all ?