Overdraft declined

I moved from my current bank to standard bank. Been a loyal customer with standard bank and have a very good credit score as well. I get updated credit reports from experian each month. Last month I app**** online for a overdraft on my standard bank cheque account. Was told it got decline based on score. I went into the branch today to do application there even showed the consultant my credit report which was clear. He was very helpful in submitting a review on my behalf. I was at the vangate mall branch western cape Emanuel assisted me. I would like this resolved and my overdraft reviewed and approved as I conduct my accounts very well and fail to understand how I could get declined extremely frustrated.