Wrong banking details

I'm very disappointed in the service I've received since trying to join Discovery medical aid. The service advisor just gets every thing wrong. First my husbands email address then she puts the wrong bank details for the debit order after we filled in the paperwork that she sent where there are clear sections for debuting bank details and refund bank details. Eventually we got an sms that the debit order details has been updated and still they tried to debit the wrong account. The service advisor doesn't come back to me and I try to sort it out myself but everyone has a different story because you never talk to the same person. This is very frustrating. Can someone that knows what's going on please phone me please.