Extemely poor over the counter service

I am a working professional is the engineering field trying to run a 24hour operation. I called the shop because my handset (LG G4) has been giving me problems that are extremely frustrating - it is only 6 months old and the touch screen has a tendency to push areas of the screen without an actual finger touch. I can barely make calls on the handset. I have no time during the week to resolve these issues and i was told by the store over the phone to bring it in. I used another cellphone to record the issue as proof. I arrived at the store and showed the person the videos of the problem. She advised me that a technician would need to see it before it can be booked in for repairs. A total waste of Sunday afternoon and 50km of diesel. I was advised to bring it in on Tuesday when the LG people would be in the store. I cell phone is an every day necessary evil and between Cell C and LG i am being extremely inconvenienced. This is not the first time I have had an issue with service with this store. I would expect Cell C to treat this matter seriously.