eSIM transfer - been assigned new number!

I followed the instructions to upgrade my physical SIM and activate my new eSIM. I have now been given a new number and the old one seems to have vanished. I am trying to sort with Lebara. Not easy. Please tell me there is a solution!! Did upgrading my SIM really result in the loss of my number?!

I’ve had same problem despite having given the PAC details to Lebara. Does anyone know what the solution is?

I have scheduled the transfer to eSim tomorrow. I also have got a new number now and I have asked CS they said tomorrow when the migration happens, it will be transferred back to my old number.
I’m transferring from Lebara to Lebara btw. Idk if it makes a difference but now I’m worried!!