This isn't customer services, We are a community forum made up of people like yourself.
I'm not sure I understand your post? Is your charger not working? if so you may need a new one, or gently clean the charging port on your phone.
As for seeing the iPhone you want, you can see them in any O2 store or via the online shop
Hope this helps and welcome to the forum
Veritas Numquam Perit
Your local Apple store should have everything you need.
They will check your phone for faults and replace if still under warranty.