eSIM confusion

[LClark]

I recently purchased an iPhone 17e with an eSIM. I activated the eSIM and all went as was supposed to, or so I thought.  
sky Mobile emailed me and said there was an issue setting up the sim. 
I have one phone number stored on my eSIM that opens an option to change it but won't let me save anything. When I phone someone, there is a completely different phone number on their display. They are both new numbers. I am not porting anything over from my old contract.  What have I done wrong? 

[caesarome]

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@LClark wrote:

I have one phone number stored on my eSIM that opens an option to change it 

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Isn't that the number that has come with the esim, if so you can't just change it I don't think.