Do you have an online account you can log into? If so - does anything show i the notes on there? It may just be that they are busy doing installs but it's also possible they "may" have found a problem that could require a cable re-pull from the street cab - and if so that may require advising or getting permission from your local council to dig the pavement or street - and getting that can take weeks - depending on the council.
VM are totally useless at communicating these issues to you - so all you can do is keep trying the Pre-installation and delivery team - On.. 0800 052 1734 - call at 08.00 to get through with least wait times
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.