How long has VM been installed? If it isnt sorted to your satisfaction you can cancel and incur no charges whatsoever within your 14-day "cooling off" period.
What booster is it - or is it actually a "Pod" - see this...
VM now supply “wifi Pods” (no longer doing cheap and cheerless and poor value “boosters”). However, their Pods are only free to customers on the 1GB, Volt (or old Ultimate Oomph) packages - is that you? If so they are worth trying - they should work for you. VM Wifi is now “guaranteed” to 20 Mbps/room it’s now called… Wifi Max see.-
https://www.virginmedia.com/wifi-max
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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.