Not willing to assist in writing

I need to calculate the accrued interest had I invested R9500 into a Money Market or Simply Save account since 2012. I accessed the website and only current interest rates are noted. So I log an online enquiry requesting the interest rates since 2012 and receive a reply from Wendy Adams that I need to call the call centre for the information. So I do so and explain my requirement to Alicia. After the lengthy discussion she informs me that they have access to the rates but can only provide it to me telephonically. For some reason she's not able to respond to my email request and provide me with the rates in writing. Surely if you're able to read the rates from your systems, you're able to type it up in an email and forward to me. Why is this not possible? My online enquiry ref # is SD***. Please just reply to my email with the information I require - it's not rocket science.