Wrong keyboard twice - Struggle to get refund

Needed a keyboard for Dell laptop. Cool found on their site the item (in Stock). Place order and pay. Next day I am contacted to say item not in stock the can send compatible. Delivery next day well done and that is where it stops. Wrong keyboard - I sent email with screenshots. Speedily courier collects the keyboard. Next day I get another - Still wrong keyboard. I Notify them to collect 2 weeks later had to remind them again. Courier collects the item. 2 weeks later still no refund multiple emails later and still no refund * payfast could not verify account * send bank details. Not acceptable service.