Very Poor Service

We have been trying to file my late father provident fund claim since last year, we sent them all the required documents via the company he was working for, we never received any update or hear anything from them, we have to call them and if we do, they always tell us there are outstanding documents. we sent them the documents they said was outstanding and they today they sent an e-mail saying they have never received any of the document from the Company. its been to long and everytime we call we deal with a different person.