Old Mutual *********** regular people hard earn money

So I invested some money last year with Old Mutual Equity. I was monitoring it on a monthly basis and I was fairly happy with steady rate. So eventually I needed the money for I requested a cancelation. The lady on the call gave me number that will be paid back to me and gave me some forms to fill out. Eventually when they transferred the money it was 2.5k less than what the lady told me on the phone and less than what it was tracking at. When I questioned it they gave me the story about fluctuations etc. So what I don't understand is, since I made the cancelation call me investment went down. It's was fine for the whole year and the lady on the phone quoted me the right pay out, so why now pay me 2.5k short. When I raised it they gave me story of fluctuations etc. I am convinced that Old Mutual deliberately manipulate the payment. It was real eye opener as the big orginasation like Old Mutual is taking regular people money for a joke. And they making sure ripping you off and collecting there money is on top off the list. I had a really, really poor experience. For any future investors stay away from Old Mutual. You will end up a losing money.