Selling a service which doesn't exist, together with bad customer service

I recently traveled to Zanzibar with Kenya Airways on a business class ticket. Within 2 days the 2 hour layover in Nairobi on the return flight changed to 8 hours! Also, the "business class" is anything but. It is Premier economy, which they sell as Business class. On the return flight, it turned from bad to worse. About 2 hours before taking off from Nairobi, I was abruptly downgraded to economy class with no explanation. The original reason was a last minute aircraft change, with 8 passengers being downgraded. That turned out to be one big fat lie. There was no change of aircraft, and I was the only passenger being downgraded for no apparent reason