new account

I went to the branch in rink steet open a investment an investment account(select) which gives a higher rate of interest than the market link account I have at present. First the consultant informed me that my information of my profile is not complete really? After 40 years with the bank. Secondly the would not accept my local municipal bill because it only showed the street address and not the suburb(all my mail goes to a post box which I have had for 30 years and all my correspondence from the bank gets posted to the postbox. please advise me what I must show as proof of address as I got the local councillor to confirm my address as the would not accept an affidavit from the police.