Why did Burger King stop catering for vegans?

Ever since Burger King introduced products for vegans, we have eaten lunch at Burger King The Grove (Pretoria East) every weekend. Now, they no longer stock Vegan Nuggets or the Plant-based Whopper. BK The Grove has not had stock of the Vegan Royale for several months now. What the heck?! Does BK only cater for meat eaters? We LOVE the Vegan Royale and would continue supporting BK The Grove every weekend BUT THEY MUST PLEASE get stock of the Vegan Royale menu choice.