Lekkerslaap reneges on its own written confirmation of availability

I attempted to book accommodation in Dullstroom, Mpumalanga, at a place called Salt and Pepper Unit 2, on 3 September, on the Lekkerslaap website. I received a written confirmation from Lekkerslaap that the accommodation was available for my chosen dates via Whatsapp. Note: Lekkerslaap CONFIRMED the availability IN WRITING.

Later on the same day, when I wanted to make the payment, suddenly I couldn't. I contacted Lekkerslaap's support via email, only to be told that the unit was allegedly no longer available. This directly contradicted the written proof, from Lekkerslaap itself, that it was in fact available. And really, almost 4 months before the booking date, suddenly it became unavailable, in spite of me receiving WRITTEN proof that it was available? Pull my other leg!

I then emailed the written proof from Whatsapp to Lekkerslaap, demanding an explanation for their pathetic so-called service, and, needless to say, no response received to my second email. One cannot trust this booking service - their so-called systems seem to be chaotic and unreliable. Their first email response was deliberately disingenuous - I had received written proof of the venue being available, so to attempt to tell me it suddenly wasn't, is just a plain lie, and totally contradicted their WRITTEN confirmation that the venue was available.

I have not received any satisfactory explanation for this chaotic and contradictory state of affairs from Lekkerslaap, leading me to think it's yet another company with amateur-hour management and chaotic systems.