If your card is lost or stolen while you are outside Egypt, immediately contact your bank using the official number and request that the card be permanently blocked or secured, depending on your bank's policy.
Steps
Don't wait until you return to Egypt.
If the app allows you to freeze the card, do so quickly, but confirm the report with your bank.
Review your recent transactions immediately, and file an official objection for any transaction that isn't yours, obtaining a reference number.
Then, inquire about issuing a replacement card and whether you can receive it outside Egypt or upon your return; this varies depending on the bank and the type of card.