This must be disconcerting for you. However, taking a pragmatic view of the situation, if the house has been fitted with a prepayment meter, it might have been awkward to move in and have to spend time trying to find out how to get the power switched on. If the meter has been topped up by this underhand procedure, you may find that it’s in fact been quite convenient.
You should check for any mention of this arrangement in the tenancy agreement - there certainly should be. And of course, you should take meter readings the moment you move in; you can’t be held accountable for any usage before then. If there has been any - e.g. if the housing agent had cleaners in for a final hoover before handing the property over - that would be for their account, not yours.
A new build will most probably have a modern smart meter which can easily be switched from prepayment to credit mode if you’d rather not have the hassle of topping-up. This will presumably all become clear once you’ve moved in.
You may find that a knee-jerk reaction to this unexpected development may not be the best approach.
Noel | I have no official status; I'm just a volunteer who comes here to help other customers. My gear: Aclara SGM 1416-B Electricity-only E7 meter; Chameleon IHD3-PPMID-AAA | It may look as if I know what I’m talking about, but don’t let that fool you. |