The Volt benefits were activated on my O2 account on 12 January, I received a phone txt from O2 on the same day to confirm that the O2 volt benefits had been applied, and I can confirm the benefits were applied on that day. So yes, the 14 days passed on 26 January.
My original contracted package is the M250. The Volt deal stipulates that the broadband boost will take broadband speed to next tier level, in my case to the M350 package free of charge.
On Tuesday 27 January at 12:08 GMT I started a WhatsApp conversation with Virgin Media to explain that the broadband boost was not activated. I am STILL in this WhatsApp conversation today and getting very frustrated. I can provide a full txt log of this conversation if needed, but it it is very long. I respond immediately to Virgin agents on WhatsApp, but sadly that is not the case with Virgin agents. After chatting to various agents, explaining the same thing repeatedly finally on txt number 414 on 29 January at 11:49 an agent confirmed the broadband boost had been applied and would take effect in 24 hours. Needless to say the boost was not applied. The WhatsApp chat continued up to yesterday 31 February, when at 14:42 an agent confirmed "The number (my O2 phone number) was not registered hence the O2 benefits was not active. However I have got the O2 number added and shall get activated in next 24 hours and you will also receive an email confirmation in next 24 hours."
It is now 13:00 and there is still no change and I am now adding to a complaint case I raised with Virgin Media to include the copious text log of the fruitless chats I have had with Virgin Agents. As a new client you have failed to impress so far!
Please see screen shot below indicating current package and Volt Benefits Status = NOT ACTIVE.

After chatting SEVERAL agents