Complete incompetence in Billing customers

We started renting a place from 1 Feb 2021, and so I opened an account with Impact Meters to start on 1 Feb 2021. They sent me a bill for water and electricity for mid Dec 20 - to mid Jan 21. I complained and said we only started renting from 1 Feb 2021. They rep**** saying that they would fix this. They have now sent me a bill from Mid Jan to Mid Feb. I am still not prepared to pay this bill, as we only moved into the apartment from 1 Feb. This is their core business, and they cannot even get this right. They are useless, but unfortunately I have no choice but to use them.