Impossible to use Travelbank Credit

On 28 October I contacted Kulula in an attempt to book using my travelbank credit. I was told the booking would be sent to British airways and I would receive confirmation e-mail to settle the balance. The e-mail never arrived. I contacted Kulula again on 2 November, when I had to choose new dates as the flights I originally selected were already fully booked. I was again told that I would receive a quotation via e-mail. On 3 November, after hanging on for hours, the call operator told me that I needed to call British airways directly and Kulula suddenly could no longer help me from their side. What absolutely *********** service and disinformation. All very well having a travelbank credit but good luck trying to ever use it.