bad handling of my transactions

I have a serious problemt in the way nedbank handles my account, i get an sms informing me what my available balance is and then when i check a day later it is completely different, their are systems are so bad they are not even able to resolve this query, even guys like capitec which are new have better systems in place. I dont mind nedbank as a bank but they way they cannot resolve my query really dissapoints me, they leave me with no choice but to consider other options