Incorrect balance

So I go to a Nedbank ATM last night and fail to receive the money I withdrew from the atm but I received a message stating the money has been returned to my account. This morning the same thing happens. I call through to the call centre and they advise me the money has been reversed into my account. I question the fact that my balance is still R3k short of what it was before all this happened. To top things off the agent tells me there are transactions that have not cleared from my account yet. I get real time notifications from the bank every time something happens or money is deducted from my account only for them to give me this excuse. I work hard for my money and for this to happen this time of the year is not on. I want a full explanation as to where this money is and what happened to the R3k of the night before that was supposedly reversed. The bank makes more than enough money off the ridiculous charges on my account yet this happens. I want answers.