Here is the useful information to help you get it.
If the sales person say that free wireless is not included in pay as you go plan, show them the evident that you are the first 2500 customers buy the 920. Here is link of evidence Twitter / Nokiapoweruser: EE offering free wireless charger .... It can not be found on any EE's official website cuz they do want people to know this. I got my charger today by showing this evident and finally the staff gave me the charger.