lost phone

I took my phone Samsung S4 in for a software upgrade at Samsung Rosebank in Johannesburg. I left it there as the technician said it will take a while. When I went back I was told the phone has been misplaced. It was given to another customer by mistake. That was Friday and it was my business phone as well. It's Tuesday today and I haven't had any concrete responses. I was promised a replacement phone. However now they are suggesting yhey will give me a phone from their repairs that have been repaired. This is not professional and shows lack of care for customers. I have been inconvenienced a lot and now offering me a repaired phone is an insult whereas Ihad only bought my phone in March. This is mediocre and unacceptable. Please don't inconvenience people like this. <br>