TERRIBLE SERVICE FROM OLD MUTUAL'S SUPERFUND - NEED ANSWERS

TERRIBLE!!!! I have sent several emails, called several times holding on for 15 minutes per call just to get NO ANSWER and NO RESPONSE. I even logged a complaint online with the Old Mutual Ombudsman - AGAIN NO RESPONSE. I need to have one digit changed on my IRP5 in order to submit my Tax return. IT WOULD HELP IF SOMEONE RESPONDED AND ASSISTED ME. Can someone contact me urgently to resolve this issue.