I have been battling a long overdue refund with BA regarding a flight originally booked in 2019... The flight was cancelled, a voucher was issued, another flight was booked using this voucher, and then again cancelled. After trying to use the voucher for a new flight, BA kept advising I couldn't as the voucher had been used. I asked them to check the status of that flight (as it never left) and the agent advised she didn't have access to that information.... Two years in, I managed to speak to someone who FINALLY recognised that either a voucher or refund was due and made a note on my record. I then decided to pursue a refund, as felt this would be less problematic. BA have acknowledged they owe me a refund. One phone call they said it will be with me in 18 working days. I then chased when it was long overdue. I was then told it will be with me in 21 working days. *spoiler* - the refund never came. I try regularly to get through to Customer Service for the automated system to advise no agents are available. I have also sent two follow up messages via the case reference link they sent me, requesting an update, but with no response. Honestly feel very let down by BA who up until this, I felt were the more trustworthy and reliable airline. I suspect they will have ruined many trusted relationships with customers by now.