There are a few options. Firstly call it in on 150 (VM Phone - free) or 0345 454 1111 (any other phone - national rate). Use option 2 (faults), dont press any other buttons when offered and you should be in the queue for the next agent.
Calling at 08.00 midweek (09.00 Sun) is the best time to get through quickly at busy/closed times you may get redirected to offshore - hence calling early is best.
If you get cut off after an automated reboot cycle, just call back in a couple of minutes as the system should know that you have just been on and it hasn’t helped and put you in the queue.
You can also text them on 0753 305 1809 include account name/number and what the issue is, there is also a “Chat” option on their website - but note that replies usually take longer.
Or you can speak to the team on WhatsApp by logging into your online account via a mobile handset and there will be a link to speak to VM by Whats App. Again may be slow.
FINALLY… A VM person will pick this up on here and respond, but it can take a few days for them to get here.
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.