WORST CUSTOMER SERVICE EVER!!!!!

On 26 June 2020 I purchased online on the hifi corp website an electric blanket. After a week of not hearing about my delivery progress i called in to the call centre and was told that no progress was made on the order. The matter was escalated and a reference number was given and I was told that someone would call me, nobody did. A week later after no call I called in and was told that theres no stock and the matter would be escalated again I was at my wits end from bad service so I semanded to speak to the manager Miss Naicker, i was referred to a Tania Le Roux who said she would check what's happening with the stock and let me know. A few days later I was told she has a Russel Hobbs brand and I accepted. I put on the blanket but it was not as ffective as I thought it was, my mum accidentally threw the box away. I explained this to Tania Le roux and I was told if there is no original packaging and the blanket has been used once, it cannot be refunded or returned. PUTRID SERVICE! IF IT WAS NOT SWITCHED ON HOW WOULD I KNOW IF IT WORKED? I WANT MY REFUND!