BAD ONLINE SERVICE WITH TELKOM

I app**** for a contract for a laptop beginning of the month, it included a few extra and really seemed like a good deal, so they approved it and I was asked to pay R399.00 within 3 days so the device can be sent. I made the payment on the 6 April 2019 and payment was received on the 8 April 2019. When I app**** the pre approval had to be done, no one informed be that the product was out of stock. I have been waiting 2 weeks and the product is still out of stock, so why did I have to pay R399.00 within 3 days after approval but no one informed me regarding the no stock situation. Either they need to replace the laptop that is out of stock with one that is in stock with the rest of the package or rather refund my money so I can take the business somewhere else! This is horrible service!