New Stansure complaint : J Maxwell SHS***

I send a cancellation letter on behalf of one of my clients to Standard Bank on 8/6/2018 requesting them to cancel my clients policy with them effective 30/6/2018. This was never done and the clients new policy with Renasa started on 1 July 2018. Since then she has been paying double premiums. I have send numerous emails to Standard Bank and even to the complaints department, but to date no one has come back to me to explain what went wrong or why the policy was never cancelled or to say that this has been resolved. I keep sending emails nearly every day, but Standard Bank is to important to even reply or sort this out. Now I have a client that is very upset and I cannot get this sorted out for her. I think that this is the worst service I have ever received from a Company and this is not acceptable at all!!!!