Wrong TV ordered by MTN consultant

I would like to report to whoever is in charge at MTN Headoffice ,that not once,not twice,but EVERYTIME i upgrade or take out a new contract at MTN,then something goes wrong.Mtn always makes a mess up,then I have to walk up and down to fix their mistakes.I have 4 lines with MTN ,and I am a loyal customer that pays on time,but they always make things difficult for me,and I am fed up of it.I feel like cancelling all my contracts with MTN as i am always getting issues with them.I went for an upgrade last week 2016-02-02,they delivered my Tv today but they delivered the wrong Tv,due to the consultant ordering the wrong Tv,and I demand that I get my proper Tv tomorrow 2016-02-12, because its NOT fair that I have to suffer EVERYTIME beacause of them!!!.And I expect this to be dealt with URGENTLY,because I haven't been a client for 4 years,and paying for 4 years to get problems EVERYTIME..I would like a response from somebody that is in charge very soon,because there is NEVER anybody to talk to as NOBODY knows what they are doing..And I DEMAND to be compensated for this unnecessary problems EVERYTIME,because I am sick and tired of always hearing apologies,it doesnt make me feel better!