FAULTY SAMSUNG J1

I received my j1 and found screen flashes. Contacted call centre who asked me to take phone to a cell c store for inspection. On arrival at the store the manager told me that they cannot assess the phone as it was a contract thru cell c direct. Upon which he contacted the call centre on my behalf. I spoke to tintswalo ref no. OBF180583. He arranged to hv phone collected for evaluation. Phone was collected nd I had to follow up on status of evaluation. Phone was returned without a call from cell c as to what my complaint was. All I recevied was a note stating no fault found. I contacted cell c again as the problem persists as from new. I spoke to a call centre agent on 12 march 2016 @ approximately 10:30 who promised a return call from a superior within 2 hours. Still no call 22:00