Cell C failure to refund R249

In October 2015 I purchased a cell phone cover for a Samsung A5. Within a period of 1 week I discovered cracks in the cover which was not cause by normal use, this was in fact due to a problem with the cover. I returned to the store to report the problem with the cover. The 1st return I spoke to Aselita and reported the problem she informed me that the manager was not available and that I have to come back the next day. The next day I returned to the store at this point I again had to explain to another person the problem I had with the product - my phone together with the cover was taken to the back and only after about 5 minutes Aselita came from the back at this point I was confused because the day before she told me that the manager is not available. I listened to what she had to say and the decision was that they will replace the defective cover with another - I asked her what if the cover has the same problem - she informed me that I can return. After receiving the replacement a week passed and the same issue reoccur. The calm person that I am - I returned to the store and dealt with Yazeed because Aselita left already.I have more to the store - this is extremely poor service