Incompetence

I called FNB on Thursday 27/02/2010 to reverse a debit in my account as I'm unable to do it on the app. I was told that my matter will be escalated to Disputes Dept. Instead of them calling me I get an SMS on Friday to contact Debit order disputes on ***. Guess what...that number has been unavailable since Friday until now. Now tell me...exactly how am I supposed to get this reversed out of my account.