Poor service delivery

had been to a cell c store in Phoenix on 03/11/2017 to take my contract LG K10 device in for fixing as it is constantly freezing, it is getting very hot when charging and even when it is using the internet, whatsapp etc. I had told the sales lady about it and was told that they cannot do anything about it and look at it and said that they don't see a problem with it as it is normal for a device to behave this way. I also told her that it has poor battery life as I have to charge daily to keep it working. I told her that it is the second time that I am having a problem with this type of device and would like to speak to a management member and was seen by the store supervisor. The supervisor looked at it and switxhed off and on and said to do that when I have a probleml with the device and it should be fine, I told the supervisor that I do that daily and still have a problem with it. She told me that she can't seem to find anything wrong and that I am the only person that they have sold this phone to that has a problem with it, I told I wouldn't have taken this phone if I knew it was problematic and only took it because the sales lady told me that it is good and very reliable as well as that it is a very popular device. They then told me if they boom it in for fixing it will take a 21 day waiting period for it to be fixed. She said that they are offline and cannot do anything on this day and I must come next week to send it in for fixing. I said to them that I cannot do that as I only have time today and will wait for them for come online before proceeding elsewhere. She told me to send it with someone else then next week to get it booked in for fixing. She and the sales lady were busy on their personal cellphones while speaking to me. I had then left the store and contacted the call centre to report this, I was put through to repairs and informed them of my situation and the service I received at the cell c Phoenix store. I was told on the phone that I can take it to any cell c store and they will send it to LG to evaluate and sort out. I would like cell c to either replace device with another make or cancel my contract altogeher. I it possible for people who work in the public eye to be do rude and arrogant. I want them to cancel my contract or give me a new make of phones not an LG phone.