Disapointing service

I had places an online order for 3 master breakfasts from wimpy which is delivered by Mr delivery. They charged me R18 for a side of add on mushrooms. I paid the R18 and geuss what... I got 2 mushroom cut into 3 pieces. The container was half empty with the little food they added and charged me about R100 for a breakfast. I called them and spoke to Shanaaz. I told her that I'm unhappy with the half empty container that I just paid for and the mushroom that they charges me R18 for one mushroom. She says to me... they are too busy to deal with it now. She then tells me to call Mr delivery to collect a portion of mushrooms making me liable to pay the costs for Mr delivery.... I mean.... realy.... half breakfast and over charged.... and she does not even have the decency to get a solution. I am disgusted and disapointed... no help and no service