@AnnaOL The eon smart display should still show readings. If SP sent you a display unit it would not work with your eon meters. You must go to the meters and take readings, button A gives the gas reading in cubic metres which is what SP need to calculate your bill. If the gas meter does not show any readings at all it means its battery has run down. Request a new battery from eon.
I would like to give my meter readings as of today the 8th June, 2020 - GAS 9976 Electricity 7259
Please achnowledge receipt of these readings!
It is really, really important to send readings to this company, if you don't they'll come up with a ridiculous, and I mean really ridiculous, estimate. They estimated mine from 3565 to 733. Figure THAT out. In November EDF gave them 3149, months later they took a Smart reading of 3565 and 2 months later they made an estimate of 733.