momentum negligence leads to loss of money

I contacted Momentum on 28/01/2016 to inquire about my life policy which I signed up for and been paying for many years, I asked the momentum agent about my surrender value and was advised that it was R146 000, i asked the agent to forward the necessary documents for me to cancel my policy and have my monies paid to me. The lady had sent the documents to me which I completed and had left on my desk however I called in on 01/02/2016 to confirm the amount payable to me and was advised that the amount now is R137 000, I was extremely angry and advised the agent about my prior call.and he advised me that he cannot do anything about changing the amount to my previous amount as it is a new month and he does not have last months figures, I asked to speak to a manager or someone who can assist me and the agent refused. It is appalling to think that i could loose R9 000 because the agent did not give me the correct information.