False advertising and misleading

False advertising and terrible customer service, I saw a promotion on Hunters Dry 6 pack @R17 from Makro liquor on onecart online shopping,the item is highlighted green with a add to cart option, when pressing add to cart the app/website does not add it to cart, when call customer care, the lady says it's a error and I cannot choose that product and they have asked I.T to fix it however she has avoided the issue of advertising something incorrect and mislead the customer as her tone over the phone had a don't care attitude like she is doing me a favour,onecart is unprofessional and very poor in productivity, they specialize in online shopping yet their is always a problem with the items they advertise, i also did not get my R150 voucher as I had a similar issue when I registered and they cleared my shopping cart and asked me to reorder.