Billing for December is Incorrect

While reviewing the Xcel app for usage today, it showed 1,858 kwh for December (including the period of the outages). Our previous year's usage for the same period was ~600 kwh. I called Xcel and they said that it 'seems' that the solar power generated by our home solar system was not deducted for December this year. Our solar system generated ~400 kwh in November. So that brings the power billed by Xcel down to ~ 1,460 kwh, which is still about 2.4X our previous year's usage in the same period. I called Xcel and they gave me a a credit for my last bill and promptly removed the data for December from the app - I can no longer see the data for December. They are investigating the issue. My concern is how I trust their data at all going forward. The meter should be 100% accurate. The numbers from the meter should be accurately represented in the app and in my bill. Not sure what to do, but I will watch for information from them and see how it pans out.

My guess is that they estimated the meter during the outage and they did not estimate the solar. In addition, their estimate was incorrect.. I will see what they determine. It should even out in the next billing cycle. It would have been good if Xcel had told me about estimates when i called. What is still weird is why they would put an estimate in the app data. Surely it would have resolved itself when the power came back?