No help from Cellc regarding faulty Samsung Phone

I purchased a cell phone contract through Cell C. I received a samsung phone. The phone has gone in for a couple of repairs and its suppose to be a brand new phone. Cell C referred me to Samsung for a quicker turnaround time. I have lost track of the number of times a brand new samsung phone has gone in for repairs and for the time period. The guarantee is only for one year and I advised samsung, to give me a new phone and the same model as this phone is faulty and the guarantee expires soon. Samsung refused and takes no responsibility for their product. I am in my late 60s and feel exploited by Samsang and Cell C.