How to cancel eUsim purchase or activate the old physical usim

[Starbit]

I bought en eUsim but it is not working so I would like to use the physical usim I used right before

I’ve tried to change usim but it says the usim is not valid 

[Rastin]

What problem are you have with the esim? What kind if phone do you have?

[Rastin]

Sim cards are a one time use you will need to buy a new one. Amazon the cheapest at 5$