VODACOM sim swap *****- no one to speak to!

On 2nd October I lost WhatsApp from my SA phone and texts and ability to make or receive calls, I am currently in the UK. On this day I tried to get onto my online banking only to find my digital profile was locked out. I have called the VODACOM number shown on their site for people overseas to report ***** every day, only to hear ‘ we cannot connect your call, please try again later’ I have completed an affidavit and filled in their online form and emailed back to them. It is impossible as I still have not managed to speak to a person. On looking at texts on my SA phone on 25th September a sim swap was requested- not me. I was on holiday in Greece and don’t often check the SA phone as a use my English one when out of SA. I have no idea what is happening to my phone bill, and wonder how someone managed to obtain a sim swap with VODACOM. Can anyone help me? Whoever is impersonating me managed to get to my bank, but fortunately nothing seems to have been ******.