Frustration from insurance companies

I wrote previously about the level of run around experienced by my wheel chair bound old aged dad. I'm still here repeating the same. The staff of this company can really be uncaring. My father sent them receipts and photos as per their request but everytime when he tries to do a follow up they ask him to send the documents all over again. They literally refer him to a new person all the time and they play clueless. This is tiring and draining. How many times can one complain about the same problem.