Very poor service and communication

My Samsung A5 was delivered by DSV Couriers from Hyde Park MTN to the Midrand repair centre HVRC on 30 April 2018 because this 6 month old phone was not charging . I started queries as to the whereabouts of this phone on 15 May. There was no record of it. I sent them proof that it had been delivered. To date I have no phone and the phone is obviously lost or ******. No one is communicating with me despite several phone calls to the store and the repair centre, and visits to the Hyde Park store. I need a phone and I expect them to replace it urgently as they have obviously lost it.