Hyundai East rand mall

I'm not happy with the service received from Hyundai East rand mall. I traded in my renault kwid 2 months ago for a megane because i needed a bigger car. Little did i know i'd be sold a problem. As i type the car wont start, i have needed to be jump started with every use for 3 consecutive days. Anytime it stops all the earning lights come on. I took it in for a service a week ago. Now im told the battery in not charging, the battery is too small for the cat and it's out of warranty. The battery was purchased in 2018 and the warranty is only for one year. This problem was knowingly sold to me. Sales Agent Bafana does not get back to me when i contact him and the manager Lesley is always too busy. I can't even drive this car to them to show them this problem because the car wont start. Please could get some advice.