Don’t buy specialized equipment on Takealot

I bought an Overlocker and it doesn’t work the way Overlockes should. Overlockers are supposed to have speed control, all of them do. Yet the Brother one I bought doesn’t which means it doesn’t work like it’s supposed to due to poor quality or a fault. But takealot won’t refund me? It’s like not being able to change the volume on your TV. You either get super loud or mute. But this is speed control issues. And now Takealot refuses to refund me because I opened the box and tried to use it? How else would I know it’s faulty? Xray vision and seeing the future? This is completely ******* in terms of the consumer protection act and I will be getting lawyers involved if Takealot refuses to refund me accordion to my rights as a consumer. I will update this only if Takealot decides to be lawful.