Debit Check Reversal

Good day Greetings to you I made contact with Standardbank Pier 14 in Port Elizabeth I consulted with one of the consultants to cancel the mandates on my account before I got paid hence the gentleman who assisted me advised that he cancelled all the mandates on my account than I asked before I left the branch what if the debit orders goes off again what will happen he than advised me that I should than come back to the branch and reverse the payments hence I went into the branch on the 28th May the lady at the helpdesk assisted and advised that the two requested debits cannot be reversed

I asked the question than I went to the Govan Mbeki branch the very same was told to me than afterwards I made contact with the contact center and hence they told me the same thing.

But why on that day when I went to suspend the debit orders why didn't the gentleman told me that the debit orders cannot be reversed verbally I acknowledge that it could be done

Now I'm stranded because the bank cannot assist me in getting my funds back all I hear I need to take it up with the service provider as I approved the mandate with

What I also cannot understand my brother in law had an account with the very same people and also banking with Standardbank hence his reversals was done successfully.

So I cannot see the point that Standard Bank cannot assist me.