Unacceptable service and not cancelling when requested

I have worked for a Discovery Advisor who wrote a Life cover and Investment for me. I have cancelled it in July 2017 or requested to cancel it but the call centre did not do it when I requested it to be done. Now my 5 year old son's bank account is overfloaded with fees not being paid and the bank handed the account over since Discovery just keeps on deducting and debiting the account. They don't want to cancel or close the account at the bank due to Discovery's incompetence. The advisor never paid my salary and left me stranded loosing a lot of things in my life and sitting with a lot of debt. I have send through cancellation requests but it has not been done and don't know what else to do to get this matter sorted out as Nedbank refuses to assist due to Discovery not doing what they were suppose to do in July.