Hello @Bunge ,
Welcome to the community,
Have you put your old SIM card in the new phone? If you were sent a new SIM card, no need to use it, if nothing wrong with old SIM card.
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using Skype or another phone: +44 800 079 8586 or +44 800 956 6000.
