Hi @Manah,
I'm sorry to hear this. 
Are you trying to download and update your apps using Google Play Store? When it fails to do so, do you get any error message, does it happen with all apps? Are you using a Wi-Fi network or mobile data when downloading/updating apps? How does your Internet works outside of this?
If you could elaborate what it is you need assistance with I would be more then happy to assist you! 
