Hang in there! My daughter now 27 months went thru that for a little while too. My husband had me read an exerpt from a book where they encouraged positive reinforcement for everything your child does that is right. I started doing it and within one day my daughter was listening to me the first time I spoke. For example I would ask her to "Bring mommy that toy please." and when she did, I would praise her for listening and tell her that I appreciate her help too.
I would also get down to her level and tell her to "look at my face please", and then tell her what I wanted her to do. She listens well when I do this too.
Hang in there, someone told me that the "terrible two's" really starts at 18 months and ends around 2 1/2, so your almost there! My daughter is becoming quite a little sweetheart!!!