Faulty smart meter/display

My smartmeter was installed on 25th June. It shows the current amount of units used but my display is completely different. Display shows both Electricity and GAS usage and costs. I am ALL ELECTRIC.!
The display shows the current usage of 1.52kwh all the time regardless of which electrical devices are switched on.
The display is about 1 metre from the smartmeter and shows maximum signal strength.