Strange Water Bill Question

I moved into a new house a few years ago. I wrote to the electric, gas and water company to give me details. All went well.


After a year we got a latter in the post "to the homeowner/occupier" asking if anyone was living here, so we filled out the details and sent the letter back again.
Heard nothing


Then about 18 month later we got a knock on the door from a water man, asking how long we'd lived here. Told him about 18 months ago, and he gave me another form to fill in with out details, which I did, and posted in their prepaid envelope.



Heard nothing.


Checking the bank account they're still not taking any money for supply or waste. I've told them now by phone, by email and by post, but they don't seem to want to send me a bill.


What should I do now? I'm at a loss.