Changing of account without notice and incorrectly

I realised that my kids did not receive interest on their account in Sept and Oct. Phoned Premier banking where I got told I need to go to a branch to have a look. This I did on Saturday 14 Oct just to get told I must submit documents. I said but I did so in Febr. She saw I did and then said I must forward the mail again to VBS and wait for them to fix the accounts and give me feedback on the interest not paid. Really and you ask how can you help me....FNB even changed the youth accounts to such a point that they pay for all cash withdraws. Maybe I should look what other banks are offering for youth as kids now pay banks to save their money.