Pathetic Service!!!!!!

In the last 2 weeks I have received the worst service from Nedbank!!! I will definitely change my bank. There are funds missing from my account that no one can account for. I was told my balance is in a negative because of a cheque that needs to clear, that was on the 04/03/2015 when I spoke to Mpho he advise his manager Meshack will call me. No one called!!! I called on the 05/03/2015 I spoke to Lethu and he also couldn't understand why funds were missing from my account he will get a manager to call again no one called!!!I called today and I spoke to Florence Mashaba and she said she will call me back, a guy then called me 10 mins later and he couldn't understand how my money went missing and he said he will get back to me at 09:30. I called back at 12:42 a consultant names Gugu Sima had me on mute. No one can assist me. This is by far the worst service I have ever received from a bank!!!Please refund my money and I will move to another bank that will appreciate my business!!!