I had a flight at the end of March cancelled in mid March (as the airline had basically stopped flying by then). Even then I couldn’t get the refund online. I was told over the phone that I’d receive a refund.

the refund still has not come through, so I initiated a chargeback with Amex. While El Al aren’t open for processing refunds now, I can almost guarantee they will be willing to put in the time and effort to fight the chargeback.