What if my partners refuse to upload contacts?

Ask yourself why you want those contacts. Do you plan to call on them yourself? That’s channel death. The thing channel partners hold most dear is account control. From their perspective you never have a need to communicate directly with their customers. This is the driving response you can expect to encounter whenever requesting contact data from partners. If the channel partner is consistently delivering excellent sales results, do you really want to compromise that to obtain data you really shouldn’t need anyway?