dissapointing bank

i am the client of Nedbank and I have a cheque account with them. in 2016 and early January 2017 was applying for a bond they declined by application due to credit bureau and I was adviced to pay all those accounts but now I stayed. Since February 2017 I was busy fixing and paying my account and all the account are paid up and I sent all the paid up letters to credit bureau to update my records accordingly and the confirmed that all disputed accounts are closed and they also sent me new credit report as proof that all account are paid up and closed. At the present moment I don't have a default or a judgement or an account that is in arrears but still Nedbank declined my application saying that my account conduct was not good. On my mind that means Nedbank will not give me a bond approval because how I was conducting my account previously without considering that all accounts are paid up and closed and I was conducting my account well for six months. I am so disappointed by Nedbank and from end of this month of November I am going to take my account to other banks who can consider and value me as their trusted customer as I am not a valued customer at Nedbank. I am do desperate for a house as I have no stable place to stay but they always declined my application and they cant even give me a credit but I have a cheque account with them not even a savings account.