SAMSUNG S7 POOR QUALITY

I bought Samsung S7 edge for my son was excited as was suppose to be one of the best phone in the market. Phone was not even 2 weeks went in for repairs as Vodacom said 7 days lapsed. First Job No: ***3 went in for repairs 29 March 2016. Phone was collected 10 April 2016. When we took cell phone home discovered that the charger was now faulty , fingerprint faulty , additional scratches which was not there when phone handed in. Went back next day 11 April 2016 VODACOM refused exchange and said will prioritize repairs and escalate. 2nd JOB NUMBER ***2. O DATE PHONE STILL IN FOR REPAIRS LOOKS LIKE THEY **** AS THEY SAID WILL ESCALATE TO HIGHER MANAGEMENT. THIS IS TOTALLY UNACCEPTABLE AS THE PHONE HAS SPENT MORE TIME FOR REPAIRS THEN WE ACTUALLY USED FROM THE TIME OF THE PURCHASE . I NEED THIS MATTER RESOLVED !!! REPLACE THE PHONE .....