Unpaid Item pricing dispute

I am once again very disgusted with Nedbank, the Call Centre in particular. Yesterday I phoned the call centre to find out pricing for debit order that was returned. I spoken to Sandile who quoted reference number ***9. He told me that if a debit order is returned on savings account the bank charge you R28 to return payment, he quoted the reference number as well as his name, and promised me should amount differ from amount quoted I am more than welcome to query it. This morning my account was debited with R70. I phoned in, 1st of all they could not pick up ref number of call and apparently its R70. I am upset because 1st of all clearly an incorrect ref was given as I repeated ref twice as well as the agents clearly dont know the pricing of items because different amounts was quoted. I WOULD NOT HAVE HAD AN ISSUE, if it was stated yesterday that charges was going to be R70. The banks just mess the clients around, you have absolutely no control over anything, they just deduct what they feel like.