Leave it switched on overnight and see how it is.
If still not working try contacting New accounts and Set Up for them to complete the setup and activation. That is 150 from a Virgin landline options 1,1,1 and 4 or 0345 4541111 from any other phone, options 1,1, 2 and 4.
Best time to call is 08:00 or 09:00 on Sundays
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BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.