SERVICE ON VEHICLE PATHETIC

I had the worst experience this morning all because of a fault from hyundai umhlanga, My vehicle went in for service last week Monday and was given back to me with all bars showing a full fuel tank. I knew something was not right but on the other hand my vehicle always has enough fuel. I traveled to Chatsworth on Friday and was driving to work this morning from Chatsworth and on the highway my vehicle switched off n refused to start. I called Hyundai and they refused to accept that they were at fault , after being persistent 1 manager and a consultant came out to view the issue. They then booked the vehicle in to do diagnostics only to find out that over a telephone conversation with Pooja a lady whom initially assisted with the booking of my vehicle for service stated that a terminal was not connected...This is absolutely ridiculous and I will be taking them up because all check lists was done and marked with a tick...Had I been traveling with a 1 year old at night and this occurred no one would take responsibility should have happened to us...Poor Service and really disappointing after all every vehicle I purchased was a Hyundai and now my image of them is changing due to poor service delivery