Why did interest appear even though I paid?

The reason could be the timing of the payment, a cash withdrawal, fees, or incomplete payment.

Reconcile the Statement Balance and Due Date and request a Breakdown.

The balance shown at the time of payment is not always the reference amount.

The figures, fees and limits in this answer vary by bank and change over time — confirm them with your bank or the official source before acting.

Source

• Central Bank of Egypt — Know Your Rights