Account Debited Twice

I am really unhappy with the services provided by Old Mutual on my investment policy. My account was debited twice in the month of March 2016 because apparently there are two policies under my name. They have also told me that my debit order for February 2016 bounced, even though I had sufficient funds in my account at the time, and also got SMS notification that my account was debited. <br> <br> I have no idea how this happened as from their side they are confusing my policy (NJ MOFOLO, POLICY ***3, BANK ACC ***) with that of my sister (NA MOFOLO, POLICY ***9, BANK ACC ***). They have both policies under one name even though at the time we created these policies, they were separate and have been debiting from separate bank accounts all these years.<br> <br> This year however something changed and the change was not initiated from our side. I am really unhappy and am considering legal action as there is no proof that neither my sister nor I, nor our bank requested this change in debit orders to be made. Can Old Mutual please look into this matter and resolve it, otherwise I am closing my investment then seeking legal advice.