Hi-Fi Corporation - Worst customer service and faulty products

We purchased a Defy C425-C450-C455 Fridge from Hi-Fi Corporation, Westgate on the 2nd of June 2019. We switched on the fridge the same day whilst it was empty to reach its temperature, waited 8 hours, the fridge didn't switch off we had to put our foodstuffs back due to most of it being perishable. The fridge at the minimum setting of 1, keeps freezing everything from 2 liter cold drinks, milk, fruits, yogurts etc. We sent an e-mail to ********** at customer service after phoning them with our issue. We provided proof of payment, told him about the issue but we have and gotten no response as to when they will send someone or what the next step will be, or if we can exchange the fridge. We keep sending e-mails and phoning, but he refuses to take our calls. Will never buy anything from them again, I just regret not coming to Hello Peter first to see all the complaints before buying from them. Guess I will have to take the fridge back and demand a refund in store.