EXTREMELY POOR SERVICE

Approximately 5 weeks ago, I took my Samsung A5 in to Samsung Gateway for repairs. Luckily my phone was still under warranty, so the repair or replacement will take no longer then a week and a half (as described by the technician that booked my phone in). Five weeks later, they had constant excuses to why my phone is not yet fixed (Parts not arrived, don't know where my phone is, etc.). I got sick and tired of this extremely poor service, where I decided I will take my phone to my Network provider to request a repair. They needed the phone to be able to send it for a warranty assessment. Luckily Samsung could figure out where my phone is, and gave it back UNFIXED AFTER WEEKS! I took it to MTN which gladly assisted and now refuse to grant warranty replacement on my phone due to the warranty that expired 3 weeks ago... Now my concern is, this is not a fault on my side or MTN's side, so what is SAMSUNG going to do regarding their EXTREMELY POOR SERVICE AND about my phone???