Non Existent Service at Old Mutual

To everyone out there who has invested money in Old Mutual or who is thinking of investing then my advice is DON'T. My Mom died on the 13th June and left some money in an annuity for my brother and I. I have begged and pleaded with Old Mutual by phone by repeated emails and have had nothing in reply. I have also threatened them with legal action and still no reply. All I want is some feedback as to when we can expect to receive our money. Their customer service is non existent as is their correspondence . Is there anyone out there that can advise me what to do next. My Mom died 7 weeks ago this week and I still do not know what is happening. The money is ours not Old Mutual's so what happens now am forced to go the legal route and force them to pay me out as well as sue them for the costs involved. I HAVE A VERY POOR IMPRESSION OF OLD MUTUAL AND SHALL TELL EVERYONE I KNOW ABOUT THEIR VERY POOR SERVICE.