Useless Call Centre. Technologically Inept. Where are my accounts?

The more I dig the angrier I get... It started when I sold shares on the Auto Share Invest platform. When I tried to transfer the funds from the ASI account to my cheque account there was a system error. Trying practically everyday for a week I keep getting the same technical error message. Then it got worse... both my ASI and Tax Free Savings Accounts are nowhere to be found and have apparently been unlinked from my profile. I decided to try my luck on my phone. It got even worse... The homepage of the phone app showed no accounts - only my UCount rewards balance. Half a dozen accounts... ****! Gone! Then I logged in on my iPad & discovered that a business credit card has been linked to my personal profile. I never instructed them to do this! Just in case you're wondering, I've spent more than half an hour on the phone with their call centre and they just said 'Sorry, we can't help.' Where to now? Back to my branch for a final try. Then probably to a new bank... after more than 40 years with Standard Bank!