i popped round last night and had a look at what had gone on.
as far as i can tell - he connected his mobile phone to the wifi, not the smart meter.
he may have done this as the house has little to no mobile signal - would he have had to register the box back with head office via an app / internet connection ?
Either way - i've lodged a complaint with their energy provider.
Apparently the documentation is to follow in the post rather than being left by the engineer.
All sounds very dodgy, agreed. But difficult to know how much is accurate from the mother and how much she just doesnt want to tell me.