Unhappy with communication from this Medical aid

I have spoken to and sent in two change of bank details forms since October 2020 and still they continue to try to get the funds out of the old closed account for which I am billed additional costs as the account is closed and I have to quicky load funds. This has to stop. I spoke to them yesterday and then was told the lady would tell them to call me but would also put me through to Contributions department. I held on then eventually some one answered and that was that. I could hear them speaking in the background but they did not take the call so after a lengthy wait I dropped the call. No one todate has called me back