Takealot returns is disappointing

I purchased a tablet in April,I have sent it back twice because the battery is faulty,it will just shut down with no indication of low battery. The person that reviews the item Melissa has confirmed twice that it is not faulty. I am at my wit's end with this , the tablet is still under warranty and I do not understand why I am not given a replacement or refund for the item. This is such horrible service on the returns team,I am very disappointed!