Because of what the electric meter could wind more than 500 kW in December?

Hello! I'm sorry for disturbing you. Can you help? For us, in December, the electric meter wound 527 kW, although by the way, the receipt indicated 536 kW. We give evidence to the owner and he is already paying. Indications in recent months:
May 5700, June 5830, July 5900, August 5960, September 6030, October 6075, November 6095, December 6622. For January everything is already normal, as usual. What could it be?

They called an electrician from the Criminal Code, said that everything was fine and we wound so much ourselves, rude and said that we should not call it anymore😂 We have energy-saving lamps. We don’t watch TV, we don’t use air conditioning, we don’t have a computer or laptop, we don’t have an electric kettle, sometimes we use an iron. Electric meter Energomera CE 102. And by the way for cold water, too, clocked up a lot. Usually 5-7 cubic meters, and in December 22 cubic meters. We live together. A plumber came and said that it was a lot. The four live and usually comes out says 7 cubic.) BUT! He said that the counter is working. Today should come to check the electricity meter from another company. I don’t know if it makes sense.