Takealot does not honor refunds for faulty products sold

Takealot has been refusing to replace a faulty UPS unit purchased and still under warranty for now over 3 months, citing several excuses, even though they refunded me for one of the faulty units, they've now been giving me the runaround to replace/refund the second unit which was also faulty. I've ended up purchasing two brand new UPS units from them and am out of pocket for over R3,500 due to this complete neglect from Takealot. They are pathetic!