Poor service, lack of urgency to refund

I ordered an pair of Brooks running shoes online o 17/05/2020 and received my purchase confirmation email. The shoes has a promotion on an was basically R1120 cheaper than normal. On 20/05/2020 I contacted customer care via email and confirmed my delivery adres and the fact that they have to call me before delivery. I received a comfirmation email back that stated my delivery instructions were confirmed with the courier as well as adres and that Sportsmans Ware house forwarded my email to the courier. On 25/05/2020 emailed customer care again to ask what the status is of my parcel. I did not receive any answer back. On 28/05/2020 a lady emailed me and explained that they now suddenly do not have the shoes I ordered in stock (although I rechecked the website which still showed in stock). She explained that they will refund me and also attached a voucher for R400. I emailed back on 29/05/2020 and explained that I am confused as my delivery adres were cofirmed. I was also very puzzled by the voucher as the R400 does not cover the initail R1120 that I would save. I also requested that my refund be done immediately on that day. This lady never responded back and no refund was done. On 09/06/2020 another customer care agent now contacted me and explained that my purchase will now be refunded this now almost 2 weeks after I have initially been told that my payment of R1729.90 would be reversed. This has surely been the worst experience ever! Would not recommend buying from Sportsmans Warehouse as they are fast to take you money but extremely slow to return it or assist.