We booked a flight and hotel to London for June last year. Flight was cancelled due to Covid but trying to find a contact number for them was really difficult. Eventually contacted them and they said they would refund our payment within 90 days. After several more calls we eventually got some of the money back. They told us they were waiting for the airline to refund them. Fast forward to February and we still hadn't got our money- they then told us we would have to contact the airline ourselves.
They don't keep you informed of any progress and getting through to them is a nightmare- avoid OPODO at all costs!