Bad service and after sale policy

My Cell contract is currently 11months old and Im experiencing problems with Samsung J5 screenturning yellow and flashing on and of even when typing or opening messages making it impossible to use the phone .2 weeks ago I went to the CellC store in Parow Centre and the consultant took a look on the system and said well the phone is out of warranty and CellC will charge me if they had to send it in to find out the problem and advised me to go to" Hi "on the second floor as they have a technician on site ,I left and unfortunately the Tec has left for the day ...well on Friday 13 th I managed to get back to Hi and was advised by the Tec just by looking at the the phone my LCD is faulty ..He also advised me to take it back to CellC cause the phone could still have a guarantee from Samsung.So I returned to CellC again just to be told by another consultant that they cannot send my phone to Samsung in Canal Walk I will have to take it myself as they cannot... Personally if there is a guarantee it is the suppliers responsibility to give aftercare service and as of yet the client have not received any service or assistance from the provider/suppliers .Service is non existent yet I'm stuck with a phone that is non operational.