the gadget team could not punch their way out of a paper bag - ignore them is the best and only advice
the extender - i assume thats a pod is also a waste of time especially if they are charging you £5 a month for it as it needs the ssid's to be the same and smart wifi to be on so you are back where you started which is the doorbell drops off line
afaik and i think you confirm it works like all smart devices on the 2.4 band so go back to the hub and split the wifi bands - just rename one of them - no need to change the wifi password - that can be the same - then turn off smart wifi - channel optimisation or whatever its called - save al that and let the hub sort itself out
from there i assume you will have to set up the door bell to access the 2.4 network - if you can reset it do that and start again with its setup
see if that helps - forget gadget rescue and send the pod back if its costing you
if you still get problems then whist i would guess the hub is not faulty its not great on wifi - sort of spec you would buy from a local pound shop if they sold hubs - ok for many but not for the few
so if the above does not cure the problem you need to look at better wifi - a 3rd party hub - a mesh system - either would be better and again if VM are charging yo for the pod use the £5 a month charge for something that was never going to help to offset the cost of whatever you go for
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Tony.
Sacked VIP
