Continuous slow/erratic speed

Supersonic, I have logged 3 cases. The first case magically disappeared. Second time around after numerous calls and several interactions with your team at Supersonic you eventually sent out a technician. While he was here my WIFI speed magically increased to 36m/s. A day later I was back to less than 5m/s with erratic speeds. I again logged a case this morning because my speed dropped to a low 0.83m/s and is erratic. I can not have a proper Teams meeting without it being interrupted due to poor signal. I am paying for a 100m/s uncapped and unshaped line. What do I have to do to get my value for my money? Move to another ISP? My 2 year contract matures end Feb2021 and I am already looking around for an ISP that delivers on its promises and give the customer what he pays for.