Business broadband priority support not actually speeding anything up

Bit of a rant really. We pay extra for Business broadband priority support and yet this is the third day in a row our line has been wobbling during trading hours. I phoned in yesterday, got told it would be “prioritised”, but I’m still getting random drops and the upload speed is all over the place. We’re a small design studio in Manchester, 6 people on the line, and when it goes down we lose work. Is priority support just a label or does it actually mean something? I’m on account BN-447192 if that helps, though I’m not posting any personal details.