Sounds like your phones data usage setting needs changing
For Android
Setting or changing the data usage warning on a Samsung Galaxy:
1. Go to "Settings"
2. Select "Connections"
3. Choose "Data Usage" and then "Billing cycle and data warning"
4. Toggle "Set data warning" to OFF if you don't wish to get data usage notifications
5. Choose "Data limit" if you wish to set a custom amount of data to use before it will be disabled
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
