Hello @Nankhoma1 ,
Welcome to the community,
If it is an Apple phone, then click on settings and scroll down to phone, you will see blocked contacts, you should be able to do so.
I suspect Android is the same, but as I do not have Android, I cannot confirm this.
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.
