If you ordered at the weekend then it's unlikely your order was processed until maybe today with the bank holiday. If you haven't heard anything by Friday then give EE a call on 150.
Thanks
To contact EE Customer Services dial 150 From your EE mobile or 0800 956 6000 from any other phone.
EE standard opening hours are Monday to Friday, 8am to 9pm - Saturday and Sunday, 8am to 8pm.