Contacts have their own thing going on-- plus, if he's leaning on them and using them overmuch, have them act like it. People get annoyed when others take advantage of them. They could be best friends since whenever, but that well goes dry if the player's character doesn't start doing favors in return.
Could make for a good 'run plot, too: 'Sure, omae, I can crack that ice for ya null sheen. Thing is, I had this other thing I had to do. Maybe you could take care of it for me, scratch my back, yanno?'
Or: "No. Hell no. After that last 'favor' I did you, I had the Star up my hoop so far they could check my tonsils. Ain't sticking my neck out that far without some good hard nuyen, this time."