ACT Fibernet — Internet doesnt work and engineer always closes ticket without fixing it.

Account number :[protected]

Every night at exactly 12.57 am my Internet disconnects automatically and it doesn't work till next afternoon.
And next day afternoon I get a call from ACT engineer and they close my ticket without resolving the issue as soon as they hear that the Internet is working now (afternoon)
Even when I explain them the problem they just don't care and disconnect the call...
This has been going on for two weeks now. Will someone fix this issue or not?