Sorry to hear the Connect App is still showing poor signal.
Appreciate you have requested a 2nd WiFi Pod but as it's only been a few days since you installed the Pod, you might need to try it in a few places to see where it will give you the best WiFi coverage throughout your home. Once you’ve found it, leave it be.
VM will only allow you to order 1 every seven days to the maximum of 3 pods, When checking speed etc from the pod remember to disconnect your wifi on your device and the then reconnect, try this first standing over the pod, then move further away and see what happens.
How are you testing this? If you are testing with ie a phone disconnect the phone from your wifi then go and stand near the pod and reconnect your phone to the network and test again and see what the coverage is like. Same with other equipment turn them off and let them reconnect to either the pod or hub they should connect to the strong signal.
The app doesn't recognise the hub. So testing coverage using the app is no good. I've moved the pod round a lot of rooms and waited 24hrs each time etc. Same result.... Unless I'm sitting next to the hub (out in the open) the service dips. Even the best service from the pod has been at half the speed of the hub, and moving just a metre or so away drops to 10% speed and regularly drops out.
I'm out of contract in a couple of months and have resigned to Virgin being a bad experiment!