poor coverage and no stock of Samsung Gold S6

Im currently a contract customer.. I have two complaints with Telkom. One being the poor network coverage in my home and secondly the fact that they choose to not stock Samsung S6 in gold but display it in their shops. Firstly for the two years I have had my contract, I have been struggling with the poor network coverage in my home. Calls get dropped, I have to constantly reconnect to 8ta network and sometimes the phone cannot even pick up the 8ta network. I have had technicians verify that the coverage is extremely poor, on 2 separate call outs but nothing has ever been done about it. I am due for an upgrade and the the colour I want, (gold Samsung S6) which they advertise in shop displays, they apparently do not stock. Talk about false advertising. They should not display what they do not stock. This is misleading and quite an *********** move on whoever made the decision to only order 2 of the 3 colours the phone comes out in. Why not stock all the colours that a particular phone gets manufactured in? Its simply frustrating. I would rather opt to change my service provider than upgrade my contract. Telkom keeps disappointing.