Hello @Amyloub ,
Welcome to the community,
Have you received bills from EE before? If so take a look at the date, we would have no idea, this is not customer service and there is no account access either.
If you need to change the billing date, you will have to ring customer service and speak to the billing department.
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.
