Bad Service from Standard Bank

I lodged a Statement of Depute with Standard Bank Chargebacks and Disputes on 14 March 2019, I only received a response from them on 28 March 2019, after having to send another 2 emails. Then there was silences. After sending another 2 emails in April 2019 to follow up, I received a response on 10 April 2019, saying that I would be contact shortly. I received no call. Again after sending another 2 emails in April 2019 to follow up, I received a response on 17 April 2019, 3 weeks ago with the same message, I would be contacted shortly. Still no call