Poor service from Standard Bank

I am banking with Standard Bank for nearly 40 years. During November 2025 I app**** for priority visas which I thought was quoted as R 500 each. Instead it was quoted in GBP, which amounts to R 11 429 each. I only had R 4000 in my credit card, but Standard Bank allowed two international transactions to the value of R 23 000 to go through on my credit card. I have logged calls since then and the last call was logged on 28 Jan 2026. The bank did contact me to verify the detail of the call and promised to investigate. Since then I have not received any feedback, although I followed up on 9 Feb, 20 Feb and 3 March.