Samsung has ****** my device and provided ********* service!!!

I had recently cracked the screen on my S7 Edge and decided to make use of my ADH. I took the phone to the Samsung Smart Care Centre in Rivonia, Johannesburg (The Wedge Shopping Centre). Upon booking in the device, I was told that it would take 2-3 working days. Usually they would have the phone repaired immediately but they did not have stock, hence 2-3 working days. It has now been over a week and I have not received ANY correspondence whatsoever to give me an update on the device - not even an sms. I tried calling in a few times and people have said that the phone is in Quality Control and will be ready by "the end of the day". Many end of days have come and gone since the promised 2-3 working days. They have only given me a copy of the form that I filled in with all the faults, but not a receipt per say. There is no reference number either. They have a whatsapp number which you can use to contact them to get an update. I did try to message them and whoever responded said they will check and provide me with an update but did not have the decency to respond. This is absolutely ridiculous. I am now starting to believe that they are contemplating *****ing my device. Please can someone senior contact me immediately to resolve this matter! This device is a tool for my business and has now costed me a week without my business device! I had to go and buy another phone today because Samsung service is useless. I want a full report on why it took longer than the agreed time, as well as compensation for this inconvenience. I paid cash for this device and expected to receive reliable and ethical service from Samsung. Little did I know that I would be traumatised by my dealings with Samsung because they're trying to get away with *****.