Hi @ashchura,
Welcome to our Community Forums! Thank you for your first post and I'm very sorry to hear that you're having some issues with your PAC code request.
If you wish to disconnect a number from your account, you can take a look at our How To Keep My Number page to follow the steps outlined there on how to get a PAC code.
However, if you're unsure if this would impact the other mobile number on your account, we would advise you contact our Mobile team directly on 789/ 0345 600 0789 to have this process complete for you. 🙂
Please keep us updated on how you get on, we're here if you need any further help or assistance.
Thanks!