Unfortunately, the terms for ordinary residential broadband are three working days from when you report the problem. So if you reported it on Firday, that means they should be investigating no later than Wednesday. That said, Openreach may look into it earlier, but the call centre won't have any way to tell, and just quote the standard period.
In a way, you're lucky that BT consider your line activated. Openreach are under-staffed, and are so busy fixing faults that new customers are often just left to wait, sometimes for weeks.
If you want better service, I'm afraid you have to pay extra for it.