Full Disclosure: I spent more than a decade working in hotels. I held positions in Operations (Front Desk, Night Manager) and Sales (Reservations, Revenue Manager). My opinions are based on that experience. In matters of compensation, that opinion is usually different than the bulk of FTers. I don't apologize for that, but I do try to be up front about it.

With that out there, I think you need to own the fact that you made the decision to drive and get your suitcase without consulting anyone in hotel management. Without question, the valet/bell staff member should have proactively found a manager. So, the hotel isn't without blame.

If I were a manager hearing about this incident (after the fact), here are the questions I'd want answered. First, who set up this luggage transfer service. Was it done through the hotel or was it something set up by your company. Second, I'd want to know if anyone from your company was present coordinating the loading of the luggage. If someone was there, perhaps she or he directed the hotel staff to load your suitcase. (If you all had matching luggage or some sort of tag identifying your meeting, I'd want to know that, too.)

As to what form of compensation offered, I can't respond. I'd want to know the answers to those questions. Additionally, I'd need to know just how important your company is to the hotel.

[For the record, I'm not asking your to answer to research these questions here. They are here to give you an idea as to how a manager might respond.]

As to who to contact, I implore you to contact the hotel directly. All chains like Hilton track complaints made at the chain level. Since you didn't give management a chance to fix the problem as it was happening, I don't think it's fair to penalize them by contacting the chain now. Plus, if you contact the hotel management and aren't satisfied with the result, you can then appeal to Hilton Corporate.