Unsatisfactory service from Hollard

I've invested money in 2021- in the name of a cash back, which was supposed to be valid for five years, and maturing this year on the 23 Feb 2026.however when it was time for Hollard insurance to make a payment to me as an investor I only got a cash payment of R1723.56 which was never communicated with me on why I only got that portion of the investment. I am extremely disappointed in the service as it is appalling and severely unsatisfactory. I do not wish to continue with this investment and would like all my monies rei imbursed. Kindly assist with the above query and treat it with the utmost urgency.