Upgrade Disappointment

On the 5th of November I went into the Cell C store in Brooklyn for my upgrade. The sales consultant suggested to me to take the LG G4 since this phone is much cheaper than the Samsung S6. Being a Samsung fan I was reluctant but decided to take the advice and got the LG G4. The phone was lying in it's packaging till the 7th of November as this was the only time my Fiance could help me to update and transfer all my existing data to the new phone. On the 9th of November 8 o'clock I made two calls on the phone and all of a sudden it was scorching hot to the extent that it burned my face and it started dropping calls. I immediately phoned the store and went in only to be told that the phone that I was using for ONE single day will have to be sent into LG for further tests that will take 7 working days. If they then find anything wrong with the phone they will decide whether to give me a new handset or not. So I am basically paying for a phone that I don't have, a broken phone that they are going to see if they can fix before maybe giving me a new one?! This is the most disappointing service I have ever received. Definitely not the way to treat one of your life long customers.