Poor Service

I purchased a brand new Samsung S6 Edge plus from Metro at Vodaworld. I was grateful that they the only store that had stock of the gold colour as I spent an entire day going to different Vodacom outlets. The phone was purchased on Monday the 7th of September. Happiest man on earth. On Wednesday I noticed a hair line crack on the bottom left hand corner of the phone. The crack looks like it on the inside of the screen. I then went back to Vodaworld for a quick resolution as I am a sales rep and need a phone. They looked at the phone and advised that they have to send it in to be repaired. What happened to the 7 day replace policy. I was told to take my phone to a repair centre where they can fix the screen the same day. I proceeded to go there but was told they don't have stock of the screen. Another setback. I called the call centre and asked about the policy around a replacement phone and was told that they cant do anything to assist. I pay R2100 a month on the contract selected and all I ask for is either a replacement phone or an equally good loan phone when my phone is sent in. If you are unable to assist ill gladly cancel everything without paying and gladly return the damag