Strokes and colour not changing on .eps file

Hi, 

The colours on my .eps file aren't changing despite using the eyedrop tool and going into the colour values and adjusting them myself. The stroke also isn't changing and has a resulted in a dashed line of the wrong colour with the right colour behind it (an improvement on not changing colour at all, but barely). Stroke menu doesn't have the dash selected, and the stroke and fill boxes show that the colour should be the one I am trying to change it to. There are other lines which are filled (not dashed) which aren't changing colour either. 

I used the .eps file format to export the graph from Matlab as my previous method of exporting a .pdf file now only produces an uneditable image in illustrator. 

tried opening the file in another illustration softwere and it worked fine. 

Any ideas?

note: attached is the graph currently; shows a dashed red line on the left which has a pink fill between the dashes. This should be a pink dashed line only. The purple lines in the middle should be a darker purple (that the dashed line above it is), and the dashed blue line above the purple lines should also be purple. As can be seen, the selected line shows as purple but in the fill and stroke boxes on the left it is showing as blue...