Bill Payment Home Page > Home > FAQs > Bill Payment Bill Payment How to pay your bills : How can you pay your bill electronically at www.dei.gr ? What happens if you enter an amount bigger than the one that is due to be paid? Who will you contact if you encounter a problem during the process of electronic payment? Where can you pay the bill if it is expired ? How can you pay if you lose your bill ? If there is a credit balance on your bill, how can you refund it?