but we are being sent the whole bill.
Didn`t you take down the water, gas, energy meter readings upon moving in? That`s the first thing I do after signing a contract with a new tenant.
If you didn`t, now you have a problem. Sending you the whole bill looks suspicious.
the law is on your side
It still depends on what the contract says. And - was the property let to other tenants in July August September period??