Mr Reidel nailed it on the heard. If this scenario fits within this statute.

What was the agreed amount? If the agreed amount is the original payment then you would be on the hook for that amount.

The landlord cannot turn off utilities as a 'self help' method to evict. If you are responsible for utilities, the landlord does not have to...

You could be on 1000 leases however you are financially responsible for the leases.

I agree with counsel. You should consult an attorney offline to prepare your case.

Yes request a trial and provide your information at court.

You could file a peace order and/or file theft charges at the local district court commissioner's office.

Yes they can sue you. However you can provide a defense and/or counterclaim. Talk to an attorney offline to represent you.

Yes a person can do this however it is illegal.

The short answer is yes. They can add charges.