Absolutely terrible service with regards to warranty

So I purchased a brand new Samsung A7 2017 edition and had it for three weeks. Never once has the Bluetooth worked, and I knew this because I have a FitBit and needed to connect my device and wasn't able to do so.

I went to Samsung Tygervalley and they could not fix the problem and sent me to Samsung Customer Service Centre in Century City. So I went there, they took my phone in but informed me that my warranty is void because of a crack in the back of the phone.

Now I cannot even remember dropping my phone in the 3 weeks I have had it, but Samsung cleverly covers their new cellphones with GLASS (?!?) at the back so that the slightest drop will let you forfeit your warranty benefit. Might I mention that nothing happened to the front of the phone as that glass is apparently stronger than the glass 'protecting' the back of the phone (why on earth there is glass at the back really boggles my mind as I had a Samsung A3 and that was covered with metal thank you). I am really very disappointed and will not be buying from Samsung ever again and will continue to inform other customers of Samsung's clever ways to get more money out of you. Shame on you Samsung.