City water personnel, have you ever had a defective water meter that registered way more water usage?

I live by myself & for years I always used 1000 gallons a month. Then one day the city decided there must be something wrong with it & replaced it. Now for the past 6 mths they say I've been using 3000 a mth. Not possible. This is my everyday routine. I flush the toilet about 6 times a day, I wash dishes once a week in the sink, not the dishwasher, I take a shower every 3 or 4 days, & I change the birdbath twice a day. That doesn't add up to more than 1500 a month for sure in the summertime & even less in the winter time. I've already checked the main line for leaks & fixed minor toilet leaks months ago.