What troubleshooting you have done so far? We did an article that you may find helpful, this will guide you a basic troubleshooting to fix this issue.
See link below.
Troubleshooting no internet connection
In the event that the issue still persist, please send me your account details (Username/Customer ID together with the address on file).
Can you get a technical person to look into my connection as it constantly dropping out on the modem for the last week.