Terrible Service from Online Store

I bought some products online, and I chose the Fourways Branch for collection (because there were reasonable quantities available at the branch). When I went to the branch to collect, I was told the products were not available. I then told the store representative I needed a full refund. I also emailed the Webstore customer care reminding them about my refund. A representative named Cameney Pietersen responded and I explained to her that I wanted a full refund because the products I had ordered were not available. She told me my refund was blocked because of a technical glitch, and the IT people were going to fix it on Monday, since it was already a weekend. Then there was silence for 3 days. On the fourth day, I received an email stating that my order was ready for collection. I went back to the Fourways branch, and the store representative told me that my order had been changed and only 2 items were ready for collection, and the store had arranged vouchers for the remaining balance. I insisted on talking to the manager, who was shocked to hear my story, and she sympathised with me. She promised that the refund was going to be processed. I then received an email from Cameney Pietersen the next day informing me the refund was being processed and it was going to take 7-9 business days for me to receive the funds. There was silence for 5 days, then on the 6th day she emailed me asking for banking details. I rep**** and told her to refund the amount back to the card used for the purchase, and she didn't respond to me. After 2 days, I received an email that I didn't provide information requested, therefore, I was not going to get further assistance. It's been 3 weeks since I made the order, and I'm still waiting for my refund. I buy a lot online from Builders Warehouse, Game, Makro and other shops, and I have never had such a horrible online shopping experience. They process refunds within minutes if the product is not available, and I don't have to send countless emails asking for my money back. Leroy Merlin is such a big shop for such terrible customer service.