Welcome to the Community!
I've located your account using your Community details and have seen that the issue is now being investigated by our Engineering Team.
Furthermore, Telstra has booked a technician to check your TPG service anytime between now and 27/Feb/2019. As per your query, this will not cost you anything.
Should you have further queries, please don't hesitate to reach out to us or may simply reply to the SMS sent by our Engineering Team. I'll be providing your ticket number via private message.