Put it in writing.
I used to write letters for a living. Now it’s a hobby. I make a habit of putting meetings and notes into letter form and following up after meetings or phone conversations.
If I have a complaint or a compliment, I find that putting it in writing means it’s on the permanent record. I always try to be professional and polite. Sometimes it leads to nothing, but other times it pays off.
Sometimes people take things more seriously when it’s in writing – be it a letter or an e-mail.
So if you’ve tried to resolve a dispute over the phone or in person, follow up with a letter or e-mail. You never know what might come of it and at the very least, your argument won’t be as fleeting as the attention you seek when you merely make a call or bend an ear.