Unsatisfactory service and illtreatment by manage

I am a 65 year old woman who purchased a Samsung S5 mini on contract at VodaShop, Savannah Mall branch, on the 31st of March 2015. I noticed that the phone could not download MMS's, data was not functional and the phone repeatedly switched itself off. I took it back to VodaShop in May 2015 and I was referred to Vodacare. I was advised by VodaCare that they had attended to the phone, however two weeks later, I experienced the same issues with the phone. I then took it back to VodaCare and it supposedly went in for repairs for two weeks and then returned to me. On the 14th of July took it back to VodaShop on the premise of the same issues. I was attended to by a consultant named Craig, who booked in the phone and recommended that I be given a new handset (OBF). I was not given a new handset, instead I was assured that the phone had been repaired. Soon thereafter the problems persisted and I went back to Vodashop and spoke to the manager, Ludwig. Ludwig asked me what I expected him to do about my problem. I did not respond and I was told that I was wasting his time with my complaint. I found this ordeal disappointing as it was not a reflection of my monies worth and lacked intergrity