False information on an investment account

I took an Investment policy in January 2023 for a yearly amount of R4000 and Retirement fund of R300 over 24 years and was assisted by Mojalefa Komane, who advised me it will be captured and I will access the funds after 5 years. I transferred the R4000 into a metropolitan account. To my surprise Metropolitan debited R4300 on the 20th of February which was not our agreement. I then advised Mojalefa of the situation and he advised me that he will speak with his manager and they will refund my money since things didn't go according to my request and knowledge, He said the data capturers made a mistake. I then received a call from Tebogo Tsholo who advised me that he is investigating my case and he will refund me my money, Another consultant by the name of Belinda called me on the 28 February 2023 and activated my retirement fund policy for R300 and advised me to send a letter for refund request for the R4000 that I transferred. I sent through the letter on the 2nd of March 2023.On the 7th of March I received an email from Metropolitan life that I must send them a Sworn Affidavit with a case number and three signatures which I fail to understand why must I run around for my money. I called metropolitan because I wanted to understand the email and the consultant dropped my call. I just want Metropolitan life to refund me my R4000 because their staff is ***********.