Are they old style ‘boosters’ or the new pods. If they are the new pods it should be mid way between the hub and the target, NOT in the same location. VM could, for £25 run a coax to the back of your house and move the hub, but then you would be reversing the problem with bad WiFi at the front. You best option is to run some Ethernet cable from the hub to the rear of your house and plug the pod into this. Unfortunately VM will not do this, you need to DIY it or get an electrician to do it.
Tudor
There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2