bad service at Samsung repairs in Bloemfontein

I took my phone Samsung note 4 to Samsung repairs centre in Bloemfontein on the 26 August 2015 the phone had to be charged twice in day the phone bear in mind the phone was bought in past 6 months on Mtn contract ,at the store they tested the phone and found the battery life of the phone was dead the promise to fix the phone the following day I called they told me the found that the phones motherboard is faulty I have been calling the store everyday they gave all kinds of excuses the last time I called they said they have ordered the stuff and on Monday I called they said the box that had their things they have ordered was lost the don't even have the decency to call or send an sms regarding the progress on the phone yet I told them I don't have a phone I can use