Socking service

After my original complaint we got the same documents again and submitted it the 4th time. Then they came back with a new form that the doctor needed to complete, we submitted the form on the 11th of February 2015 (which the doctor told us that this is the first time they had to submit such a form to old mutual). On the 23th of February 2015 I requested an update to which I got a responds 3 days later that was also after I used old mutual's internal complaints department. Today I got another email now requesting doctor's report which we also submitted. I phoned and the call centre lady said the doctor can't say N/A to certain information (which anyway has nothing to do with the type of injury regarding the claim). Can someone anyone just give us a final list which if we submit this list of information is last thing we have to submit. Old mutual keeps on requesting more and more information which delays the pay out even more. O and the broker does nothing to help us. My in-laws are going to lose everything because of an Endless list of information that is required.