Discovery invest discrepancy

My husband invested in the 200 plus in October 2020. The investment matured in December 2025 and the numbers do not correlate. He has not been able to get clear information as to how funds were calculated and deducted. They send him around in circles from pillar to post not answering the request for detailed statement of how they did all this. The doubled amount rhey give is not double his investment to begin with. The boost is totally demolished with a fee that places it in a negative amount. Then the main amount opening blance is at least R25000 short of double and another large deduction of capital gains. He loses over R100k and rhey don't explain how these fees are calculated. He has mailed actuary dept. They just send some amounts but do not answer what he is asking..broker forwards to head office and we are nowhere. We are desperate as the funds are needed but we need it settled before withdrawing. All amounts vary that are given. No uniform amount. It would also seem that capital gains were also deducted on the quarterly report. There is no clear communication or answers