Water Meter Malfunction?

[Mike M]

I have a very strange situation.
I was taking reading on almost everyday to see how fast the numbers are moving.
2 days later it showed 200 Gallons
6th days 700 gallons which is too high since we did not do laundry and used dishwasher just 1 or 2 times

I kept making conversation with customer service

Then on 7th day it jumped 4500 gallons !!!! I was shoked ! Customer service said there must be a huge water leak.. I called a professional and he shut off main line and meter stopped !! he said this means there is no outside leakage
Then turned on to check all toilets and checked everywhere inside and found one very negligible leak in one toilet which was slightly overflowing, like just you can wet you finger... so it was very small... worst case it can add 1 or 2 gallons a month...

So, the question now is, how can it jump 4500 gallons in 24 hours??

Any of your help is highly appreciated...