Could Not Get Anyone To Call Me!!!!

This credit union provides the worst service ever (or not). My son applied for a loan - was told it should be ok so we left. Never got a call back. Left three voicemails over a week's time, and no reply. Finally got someone in Loan Department and explained what happened. He apologized and said that even with more money down, my son could not get a loan (which is all we wanted to find out). I asked to speak to the Loan Officer's supervisor about not getting a return call from my three voicemails (along with nearly a dozen calls I made that went to voice mail). He assured me that he would get back to me that day but never did.
What does it take to get someone to keep their word? Or place a return phone call? If this is the way you get treated before becoming a customer, what happens after they've earned your business.