A VM person will respond here in a day or two.
In the meantime call it in this way.
Call it in on 150 (VM Phone - free) or 0345 454 1111 (any other phone - national rate). Follow options 1,1,4,4, “thinking of leaving” and say you want to cancel if they cant supply you the speeds you are paying for.
Calling at 08.00 midweek (09.00 Sun) is the best time to get through quickly to the UK based "retentions team"
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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, 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.