Bad customer service

I bought a Russell Hobbs iron at Clicks Clear water mall and it stopped working in less that 6 months, Then I returned it as it was still under warranty and they exchanged it with a new one however the new one also stopped working in less than 4 months, Again I took it back to Clearwater mall with a receipt. The store Supervisor by the name Patience said they were going to book it in for repairs. Its now 3 weeks and the iron is still not back. This is such an inconvenience really considering that I used money to purchase the item. I don’t even want to begin to describe the Supervisor’s attitude towards customers. I’m a receptionist at my employers’ company and trust me even on my worst day I still treat customers with respect. Can anyone please give me urgent feedback with regards to this issue. This is from an unhappy and disappointed customer