POOR SERVICE- NO FEEDBACK/RESPONSE

I have sent the documents to Link services to claim my late mother's shares on 31st July. Well, I used fast mail that normally takes 3-5 days to reach their offices. I called 2 weeks later and they told me it should take 5 working days to process. Since then, every time I call I'm told a different story. No one from the Link Services called or emailed me to tell me what is happening. I always call them to find out what is happening with the claim. All of a sudden no one has information on how long my claim will take to be processed. I have no one to contact as telephone consultants are not allowed to give out contacts for the people who have information.