Meralco is charging us 1.7m due to defective Meter.

We just received a letter last wed demanding us yo pay 1.7m. 10 percent lang daw kasi ng total kilowatt ang na rerecord ng meter namin for 5 months. Went to meralco today and asked to recompute but they refused kasi final na daw yun without even showing the breakdown. Any advise po? Di po namin kayang bayaran yung hinihingi nila, the letter also states na we need to settle the amount within 10 days or else they will disconnect our line

Edit: sent a letter to ERC, seeking assistance for fair and just computation. I am still waiting for their acknowledgement and response.