I haven't had water since June yet they send me a ...

I haven't had water since June yet they send me a bill for $224 in usage charges for July and August, also stating that I used 21,000 gallons of water. How can I have 21,000 gallons of water usage if I do not have water sevice? They keep telling me that maybe I have a leak but again how can I have a water leak if I do not have water to leak?