2 month old phone still not repaired

Upgraded contract 21 may. Days later my Samsumg s6 started dropping calls. I thought this was network related, until phone kept ringing after connected and speaking to the other person. On 15 June phone was booked for repairs. Was returned 24 June. The \main circuit board"had been replaced. I turned it on at home and discovered the camera was not working. I left for a 3 week holiday the next morning and was unable to take it back. On 21 July I took the phone back. On 27 July I received a message to say phone was ready for collection.Upon arrival at the store I was given a tax invoice to sign and my phone was given to me. i asked the lady to insert my sim to test the phone before I left. The invoice showed the engineers report saying 1) RNR 2) customer to request a samsung account. I asked what RNR was to be told my phone was \""wiped\"" The phone wouldn't turn on and she gave it to technical guy who suggested I take it to SAMSUNG! I am paying Vodacom "