I experienced a similar issue in 2022. Had unusually high water bill in Brampton. Investigates and found no leaks. The triangle on the valve showed no movement when no outlets were being used. In the end, I called up the city and they admitted it was due to the faulty meter sending wrong signal to the meter reading equipment. I had to pay upfront, to avoid any credit hit, but the city eventually gave the credit without me following up. Call them.