No broadband fibre internet for several days

In past 8 days (24 December 2023-02 January 2024) my uncapped fibre service has mostly not been working. On some days, it would work for about 1-2 hours and then it's down for the rest of the day (e.g. yesterday). In the last couple of months, the service has deteriorated significantly and is now mostly intermittent. The worst part is this happens a lot during online meetings and thus forcing me to hotspot myself using mobile data. In September, they increased the premium, but continued to provide the same unstable service. According to their terms and conditions, the service is provided on a "best effort basis", but what I've experienced is nothing but "poor effort basis" (especially given the increased premium).

They're able to bombard my phone with useless ads about ringtones and games, especially the SIM Toolkit push notifications but they cannot send a single notification explaining why the service is down? This is terrible customer service and if it happens while I'm at work this week, I will cancel the contract. My initial 12 month term is done and there's really nothing holding me back.