Incorrect beneficiary details - still waiting for Management to resolve

Recently when I received my tax certificate I went in to my statement and checked my details; the greatest surprise came when I noticed that 3 beneficiaries were listed on my plan that I had no clue about and did not even know who they were!! I called Old Mutual Customer Services only to listen to on hold music for 15 minutes (which annoyed me even more) before I got to speak to someone. I was told that a scan had been done incorrectly to my file and that it would be escalated to management and I would have feedback by the end of the week - 5 working days later. It is now two weeks later and surprise surprise - no call and no amendments to my policy. Clearly I am not an important client and they don't take this error seriously?? I have even tried amending my details on my portfolio online and it just reverts back to the incorrect details and so now I am hoping I might get better luck here with someone attending to my problem. Shocking service, lack of solutions and disregard for customer care. I want this sorted now and honestly would love to move my policy to somewhere that is more efficient and easier to contact / resolve issues.