Disgruntled Consumer - Why issue a fight voucher if you can't get the flight which you book for.

<p>In an attempt to redeem my flight voucher( booking a flight from CPT to JHB on the 2nd of Jan 2017) I was told that the flights are "full" for this day , if a spot opens up they'll let me know and book the flight. They also said that they'll contact/ email Kulula to see if they have bookings aswell for this day, yet when I go online to make a booking via British Airways ( and Kulula) there is ample space for the particular flight on the 2nd of January 2017! so please do explain how the flights are "full"!?!?!?!? </p> <p> </p> <p>The voucher which I received was due to a mistake on a previous flight which British Airways made. now when I want to redeem my voucher they're giving me stories....</p> <p> </p> <p>This is truly unprofessional for a company like British Airways!!</p> <p> </p> <p> </p>