Closed my account after 10 years and stole my money

I have been a client for over 10 years and Standard Bank have closed my account with NO notice, not even a courtesy email. I'm currently overseas and have a sars refund due to me, with the account being closed I now cannot access my refund. Not to mention that I still had money in a joined account and so far, Standard Bank are just not able to tlel me what has happened to my money?? This is theft and (not surprisingly) total incompetence as usual. I am unable to call the bank from overseas so I've reached out to their social media platforms which has just caused me more trouble than anything. Useless replies and we just keep going round in circles.