@LM53 ,do you not have anything with your old number on it? As @XRaySpeX has written, this is not customer service and we have no access to accounts and do not know who you are, and I suspect that customer service will not know either if the number was cancelled. There must be other ways to update if you do not have the old number. Try contacting them and see what they say, nothing we can do here.
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using web based app or another phone: +44 800 079 8586 or +44 800 956 6000.
