Financial department or the person in charge to do the financial is still not good, and it should be changed. Paper work and what's the deals must spelled out clearly and properly as client agrees with the sales person, not hiding, nor written down. Spell them out. Customers are not stupid and if they still continue serving and treating customers like idiots then surely next time, there will be no deal, no sales for the store, just feel regret for working hard people (sales men/women) try to make the deal and financial person (or the person making paper work) screws it up.