Damaged Goods

My sister bought a laptop from your store in Edenvale, she did advise the consultant that the Laptop was for work and she was told that the laptop works beautifully. The laptop started giving her problems and she took it back to the store and they claimed to have fixed it. She got it back and continued to use it but it started being problematic again. She took it back and requested a refund. Since then no one from the store calls or updates my sister about her refund. We've call the customer care, laid complints but still no help. The store manager Sello has no idea what customer service is, he is rude and he has done nothing but give bad attitude when ever we call the store to find out the status of our querry. These laptops clearly have a problem because She was not the only one who bought that laptop so did others and they too are going through the same thing. Russels needs to call back their Sansui Laptops they are faulty, Russels needs to take its staff for customer handeling training. I am not happy !!!!