Can't withdraw own money due to system upgrade

I have a stanlib unit trust investment and want to withdraw funds from the account. For years I made use of their online system without any problems. However their online system has changed and the bank account I want to used does not reflect as an option and they do not allow you to pay money into a 3rs party anymore. This is the bank account the debit order comes from every month but I can not have money paid back into that same account? We immigrated to Australia in 2018 and that is why I have no other bank accounts left in South Africa and why I can not just go to standard bank and sort this out. I have been trying to get access to my funds for months. I have emailed. phoned and sent Facebook messages. I even tried contacting a broker to have someone in SA to help to no avail. Any other ideas how I can close this investment account or just withdraw some of the money?