Paid cash but dont want to refund after one day

Complaint – OK Furnishers Westonaria To whom it may concern My father bought a washing machine from OK Furnishers on Wednesday the 13th of September 2017. Defy 18kg Twin Tub. The next morning my mother did washing with the machine for the first time. Unfortunately this machine’s performance didn’t live up to expectations. My parents went to OK Furnishers and said they don’t want this machine. They said they can’t take it back. After a lot of calls and visits to the branch, customer care and Regional Manager Sakkie they’ve send out a DEFY technician to come and check the machine. According to the technician there is nothing wrong with the machine. That’s the way it performs. My parents again said then they don’t want this machine. If they could have test it in the shop and see how it performs they won’t definitely not have bought that machine. After several calls and visits again OK said they can’t give the money back even if it’s one day because they machine has already been use – But according to the sales lady I spoke to ALL products have a 7 day return policy? They said my parents must come and choose another machine. My mother wants a twin tub and the only other option was a 13kg Defy twin tub which was promised to perform better. This was bought on the 15th of September 2017. First wash – SAME story. Very poor performance. They even gave my parents the demo one from the floor (damaged on 3 places) after they promised it would be a new machine because there is stock at the warehouse. Just later to find out there is no stock and the demo will have to do. My parents is not happy at all and don’t want this machine either. Is there no way they can just get their money back? OK can come and take this machine back. They really don’t want it.