Baton Rouge Water Company review: My november bill

Today is December 5th. Also the day I spoke to Customer Service three times about the same matter. I received my November bill on December 4th which contained a past due of 214.82 which would need to be paid by December 11th to avoid disconnection of service. I was confused about this because the last bill I received was for 50.00 plus change, which I paid in November around the 20th. Also paid 217.95 around September 12th. I always pay online and there is an extra fee for paying it which adds a few dollars to the bill. Because I was confused about these numbers on my bill I called customer service for water and waste. The information I received was conflicting because one told me I had a carry over bill from my prior address which was 350 E Polk St. I did not have a carry over balance and I have been living at my current address 170 Steele Blvd for two years. I know for sure I did not have a carry over bill because it was all paid. The rep from the water company advised me that someone came into the office and paid on my bill by accident so they credited this customer's bank account, therefore leaving me with a past due of a bill I know nothing about. When I asked how this happened the rep advised me that they applied the customer's payment to my account in error. If a customer came into the office with a paper check to pay their bill, how could my account be pulled up without the customer giving the account number or the address without me being present. That's the first thing customer service ask for if there is no bill present. So did this customer have a copy of my bill or did customer service pull up my info in error and apply the payment.? Could someone please explain this to me. I am not understanding it at all. Someone did not follow proper procedure and now it seems I am left holding the bag. I need answers. My account number is [protected]. My phone number is [protected]. I would appreciate it very much if someone in charge could contact me in reference to this matter. Thank you in Advance.