Help with a part that is not wanted

I have a middle part that is not wanted. Right after I wash my hair I put on spray gel and a little hairspray and blow them straight back, then I put two large rollers in them, rolling my hair striaght back. My hair on top is cut somewhat in layers, the rest is a bob cut. Please send me some help telling me how to get rid of this part. I need some height on top of my head. Thanks for your help and advice.