Capture a permanent record of that original activation date of 14 Nov (screenshot your can save yourself somewhere etc. rather than relaying on online info which has a habit of disappearing or being replaced by VM)
You should start keeping a detailed record of events (dates, times of all calls, messages, texts etc. along with any missed appointments and failed appointments where someone turns up but no work was carried out). Keep the record in a timeline format with links from the timeline to each piece of recorded evidence. This will make it easy for you in the future to put forward a case to arbitration for the correct compensation, should that be necessary.
https://www.virginmedia.com/help/billing-and-payments/automatic-compensation