I just got a smart hub 2 yesterday, was told it should turn blue at midnight, but it's still flashing purple the next day, the cables are all connected properly, can someone help me please
You need to phone customer services 150 as it appears your line is not activated
does your phone work?
I don't have a phone yet as it's my first flat, but I had a technician come out last Tuesday to activate it, he says it is activate and should wait til midnight for it to come on, but it's been a week since then and it hasn't stopped flashing purple
Then as @imjolly says you need to get onto customer services.
Without checking with a phone at the test socket, you could be charged if the fault is within your own wiring, or the way you have things connected up.
A basic wired phone costs less than £10, and could save you an £85 visit charge.