Angry Samsung Customer

I visited the samsung store inside Mall of Africa and I was not at all impressed by the gentleman at customer care. My phone's navigation systems are all currently not working and instead of giving me viable solutions to fix this problem he just told me that they are working without even testing them. Google maps will calculate the distance however will not give further instructions when the trip is started. I tried different apps such as Waze as well as Offline Maps and Navigation and none of them work once the trip is started. When I asked him to book in my phone for further analysis he refused and said the phone is working. As a long time samsung customer I was very disappointed at his lack of care and sympathy towards the matter. I walked out the store quite upset and he seemed unbothered at the matter. His tone was very condescending and he had a rude smirk on his face. My problem is my phone is still not fixed and I don't understand where exactly I'm meant to go if the manufacturers of my phone are not willing to examine my phone further.