If you click on your phone settings, then "Cellular", check to see if you have 2 SIM's listed, primary and secondary.
Make sure the Public Mobile is the Primary and make the secondary your previous provider and turn it off. The issue could be your phone has 2 active SIM's and your primary was your old provider. Then you should see the cellular network bars show up. Let us know if that resolved it. If not send a private message through that link above, I've read others that got a new eSIM provided by an agent and that worked to fix (if there was a charge, they will credit it.)
