Welcome to TPG Community!
If you are experiencing issues with Vodafone connection, you need to contact their support team in order to check your service.
If the issue is within your TPG internet service, then we need to run further check if what's happening with your connection.
You may also refer to the article that we've created that will guide you on how to troubleshoot a slow speed issue. Check this link: https://community.tpg.com.au/t5/Featured-Articles/Slow-speed-issue/ba-p/1197.