I use antibodies from Cell Signaling, but they only recommend their in-house controls, which you cannot purchase. I have already tried HeLa and Jurkat whole cell lysates, and both show up on lower kDa.
Seed your cells, after 12 hrs subject them to serum starvation for 2-4 hrs and then stimulate them with any growth factor (e.g. EGF) for about 60-90 min and then collect the cells and try for western as well as Immunofluorescence.
Hope this will help you to find out how your antibody is working.