Hello @Saira12 ,
Welcome to the community,
You will receive the refund within 5-7 working days back to your card, this is done automatically, as your order did not go through, you need do nothing.
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using web based app or another phone: +44 7953 966 or +44 330 123 1105.
