Refused me to return with my

I travelled from Lanseria to King Shaka airport with battery operated s****** (Hover board) on Sat 20 Jan on Mango airline. On Sunday 21 Jan, they refused me to travel back with it, because it is not allowed. When I asked why did Mango at Lanseria Airport allowed me to travel with it, they simply said they cant answer for Lanseria.

I asked Zoleka Mlomo of Mango Airlines to show me where it is written that the s****** is not allowed, she couldn't.

She said to me, its either I leave the s****** or miss my flight and make plans back to Johannesburg. I have to leave it there because with her because there was no way I was missing my flight

Back at Lanseria I asked why did they allow me to travel with it if it was nit allowed, they were simply surprised that Durban did not allow it back

What really is going on with Mango? Is this their (staff) way of looting from their passengers?