Is the house behind you also Manzara construction? If not, cannot see how it is relevant.
This payment to Electricity company is to them, for work they have to do, presumably not to another third party? Has every villa, the 4 of them, been told it will cost 2000 lira each to get onto mains electric and so off builders supply?
What does your original agreement with Manzara say about electricity supply? If nothing, not sure you have a leg to stand on. Did you have a lawyer originally who can help? If you bought direct from Manzara, obviously you have no recourse to an estate agent. Sorry cannot give happier info about this..........................