Old Mutual makes a mistake but is in no hurry to rectify!

When cancelling an Old Mutual Max Investment plan for the purpose of re-investment in a life annuity with another insurer, I was short-paid by some 90 000 Rand. Needless to say that I complained immediately and whilst I was promised a feedback within a day on the phone, I later received a letter from Old Mutual stating I should expect feedback within 5 days. Today now, when I enquired about the whereabouts of my money, I received another letter, stating that the feedback would take about 10 days.....so, are we talking now 15 days already? As a pensioner, I am not in the business of advancing funds to the country's largest insurer. I want - what is due to me - now! Not in 10 or whatever days. And make no mistake, I want the money paid with 7,45 % interest per day, as this is what I am losing out for not having the funds invested in my investment account.