I had some work completed in my home by a licensed business from a local Heating & Air Conditioning business. I needed some repairs completed on the radiant heated flooring in the master home office & washroom. The cost for the repairs was significant. I saw a copy of the bill before some swings were made. The other bill came in the mail & I was particularly surprised by the amount. The total for the charges did not add up to the amount they still wanted me to pay. I contacted the Heating & Air Conditioning service supplier & I was asked to call back the next morning to speak with their business affairs department. That seemed satisfactory, although I was aggravated that I did not have anyone to help me that morning. I called back the next morning & got a voictext. I left a message & the person called me back an hour later. I explained the situation with the charges & the estimate. The woman in the accounting office asked me to hold on the line. She was gone for a long time, although she came back to the line with good news. She found the other invoice & apologized for decreasing the numbers. The bill was off, because she mixed up a 6 & a 9. The mistake was really due to the bookkeeper & not an issue with the Heating & Air Conditioning service team at all. The bookkeeper fixed the billing error & apologized many times for making the mistake & causing the problem. I did not mind the error as long as they fixed it & credited my account.