So, they gave you a disconnect notice for being just three days short? That is the craziest thing that I have ever heard. You just got the bill and it is going to be shut off Monday.
Thats how companies work here in a third country. The problem is payment for my apartment came along with the bill. I thought the electricbill will be issued atleast one more week. I have no enough money to pay for both at the same time.
Rather than go this route, I think you should contact an attorney immediately, that cannot be legal. I am sure that if there was a notice prior to now you would have paid the bill in due course, knowing that it was due, therefore you have not been given what is the legal notice in just about every country in the world.