Do not worry, I have the same, it is nothing to worry about. It has obviously changed as it had a different number before, could be an update, and that is why, nothing for you to worry about, it changes every now and again:
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.
