Samsung service sucks!!!

We bought a TV from Hirsch's in October 2017, its a 55 inch curve TV that cost us a lot of money! Last week Tuesday the whole TV screen went green, and it stayed green. I called Hirsch'sm the TV is still under full guarantee, but Hirsch's contacted Samsung in order to have this issue fixed. A big Company like Samsung, you expect good service, well guess again the service is horrific. I waited till Monday for a technician to come out, only to be told without opening anything, they know it is the screen and they need to order one, again it is Samsung, you will think they have stock available. The technician told me that without a doubt 1st thing this morning they will come out to replace the screen, at 14h00 today I had to call to find out what happened to 1st thing this morning, only to be told, the part has been ordered, and we don't know when this will be sorted out!!! How does a big Company like Samsung give such terrible service?