The current VM installation process is badly managed when things arent straightforward. So dont bother chasing it. Let them play their games and let the installation play out. Do nothing. You pay nothing (£0) until a VM connection is installed and activated. And even from then (if it gets that far) you have 14 days in which to cancel - again with no costs. Or keep it if you like it in those 14 days
Can you connect to OR,Sky, BT etc - or a 4G/5G service - perhaps on a 30-day contract? Three and Smarty have a 30day 4G unlimited package for £20 (or less on a deal). If so, do it now and just let the VM install run its course. You will pay nothing until VM's service is installed and operational. When it finally happens, as said, you have 14 days in which to cancel it at no cost to yourself and keep the other service. Or, if VM is working to your satisfaction, keep it and cancel the other service (hence better if you took a 30-day contract).
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.