INCORRECT MEASUREMENTS ON BED SHEET PACKING

I purchased a King size fitted bed sheet from Edgars, at Cape Gate, in Cape Town. I took the sheet back because it did not fit on my bed. The manager of the store at the time, told me on twice that they don't have stock and that he would exchange the sheet. He has left in the mean time and is now working at CNA. Went back to the store just to find out that I have to take something else because that is old stock. I went back home 10km from the store to fetched the flat sheet and two matching pillow cases just to be told that the particular goods are on sale and they can only return it on the sale price. I off cause opted not to do so. On my return home, I decided to measure the sheet in question. To my surprise it differs from the measurements of the packaging. I am so disgusting in Delmarie at the branch who was well aware of the problem and promise that was made to me. She is now turning a blind eye.