Refusal of withdrawal on my policy

On the 14th March 2025,I went to Old Mutual offices in East London. The reason for going there was to withdraw my investment of R30000 which is linked to my Greenlight life cover. I went there because I had a bereavement at home. They told me that the money could not be withdrawn as it is restrained by Old Mutual. I feel very much inconvenienced because I want to contribute in the funeral arrangements at home. Also I was never consulted before the money was restrained. I humbly request your intervention in this matter.