prestige banking BAD service!

on the 18th feb i deposited a cheque at the fourways mall atm. on the 23rd feb i got an sms to say the cheque was unpaid from my account back to the company. i called Standard Bank and git this message: Service request no. *** due on 24.02.2016 is now open. i have not had any feedback. i have called twice more and i have been into the branch. i have also sent an email to my phantom 'prestige banker' with zero response! thats 5 contacts with standard bank in a week with no reply! ihave also contacted the company that wrote the cheque and they have told me in writing that they did not stop the cheque so why was that money reversed? where is the cheque? it is a large amount of money and i am disgusted at PRESTIGE banking! i would like a response and a resolution as soon as possible. this is unacceptable <br>