Actually, it was my mistake. I wasn't attentive to check if I was charged on the Internet service. However, they are very tricky. They waited for 6 months and disconnected me, then. Instead, they could disconnect me in month if I didn't pay. It is also ,,food,, for their lawyers. I overpaid 150 NIS ( for Internet service I had to pay 300 NIS and 150 NIS for the lawyer)