The worst customer service of any company ever!!
You simply cannot access customer services number ever! They just cut you off.
I applied for a voucher as we couldn't travel.We never received any written confirmation of the voucher, and were still getting emails about the flights.So we thought we'd still have to travel when we didn't want to.
I eventually had to call their booking line for them to confirm our holiday had been cancelled (which is what we wanted).
Never book direct with them.ONly book via an agent as at least that way you could easily call the agent to make any amendments.