Payment reversal

Please help last month I transferred money into a wrong fnb account. On the 1th of August I reported the matter and a payment reversal form was sent via email. I completed the form and sent it back Sametime. It says I will receive the respond within 10 working days.

I went into the nearest branch to make a follow up. Later on the day I received an email saying they won't reverse the money because they are unable to contact the client and they tried it several times. I'm unhappy this respond and I won't rest until I get my money back. I'm disappointed I have been banking with this bank for more than 20yrs. I want this message to reach the shareholders and CEO. I want my money within 24hrs.