I agree, get the local paper or tv station involved. Make a public stink. Contact the elected official in charge of the police department and complain. Complain to regional Wal-Mart managers.
E-mail/fax O'Reilly, Ann Landers, etc. Any national consumer affairs organization. Complain to senior services, file an ADA complaint, complain to AARP.
The more places you complain and provide them with the local Wal-mart manager's name and phone number, the more enquiries will be made and the bigger problem you become, the faster they will fix it to shut you up.
Thanks for the advice. You're right. I need to be making a big stink because Walmart does not want the publicity. The manager's name was James Bozard, btw. He was nice and helpful to my Dad, but said his hands were tied and couldn't do anything because it is Murphy Oil's responsibility and not theirs.
Thanks Valpal1. I wrote all those down to call/email tomorrow. I knew if I came here, Freepers would have some great ideas. :)