LM Berea Grass dying

LM Berea grass was planted at my home on 29 September 2015. Cost R5216.00 for 38 square meters. The grass is slowly but surely dying irrespective of what I did to prevent it. The company's ad state that the grass will grow everywhere - sun, shade - everywhere. I'm of the opinion that the preparation of the area were not done as advertised, causing the grass to die. My wife, which was at home when the grass was planted, noticed that the existing soil was only chipped a little and a thin layer of soil (almost non-existant) was added on top of that. I've paid R465.00 for organic compost and R1750.00 for preparation of the area. Struggling to get Walter to come and have a look, assist and re-plant if necessary as from 5 January 2016. All you get is a promise that he will be coming over to attend to the problem but he never pitch. Future clients can expect the same situation and be aware that no assistance will be given after the grass has been planted and you will sit and wait for him the whole day to arrive.