bad service - why should i pay so much to fix a poorly manufactured device

I purchased a phone , the charging pin was quite tight to a point that I have to force the charger out/in but I thought maybe because its new I will see in a couple of day. On the 4th day after receiving this new device the phone fell from my pocket (I was sitting in my lounge on a low chair) the phone fell face down, I picked it up, looked at the screen and saw no damage then placed phone on the table. When I later wanted to use my device it didn’t switch on, I then realised something was wrong and the next day took it to the store. The consultant looked and her words were “this is strange there is no damage on the phone , I will get someone from the back to look” she took the device with her and returned with another consultant who showed me the tiny crack on top corner of the screen and her words were, “I needed to hold the devise up to a light to see the crack”. The consultant advised me she will send it to MTN for a warranty assessment and maybe they will repair it free of charge as I’m in 7days however she can’t promise anything as it is physical damage so they might charge for a repair. I was in agreement to this and the following week received a sms from MTN quoting me R985 to fix a phone which cost R2500. I spoke to the MTN consultant and expressed my concern with the fault and they directed me to the store when I got to the store they directed me back to MTN, I called MTN from the store and the consultant advised me that there is nothing they can do as it’s not a manufacturing fault. I expressed my disagreement in the fact that a new phone fell less than 30cm from the ground and I’m left with a completely broken LCD and a tiny crack in the screen costing me 40% of the phone value to fix. This is ridiculous, I would have understood it being an old phone that fell more than a couple of times now causing so much damage but a brand new phone that fell once to be that greatly damaged I believe it is a manufacturing fault as the product is poorly made if it can cause that much damage after falling not far from the floor. I’m upset that Truworths didn’t do anything to assist me in this matter as I purchased from them and I liaised with them but all they keep saying is that “ we can’t go against what MTN is saying” I didn’t want to take the device back and informed the consultant that I’m going to take this matter further but the consultant advised me that I have to keep it even though I wasn’t happy to have it. Truworths advised me that I need to take this matter up with MTN service provider, so I'm writing to let you know that I am extremely unhappy with the bad service I received and the ridiculously high price to fix a phone that was poorly manufactured.