Mission to close off the overdraft! Unacceptable

2 weeks ago I tried closing off my overdraft, the app indicated the minimum amount to decrease the overdraft to is R1. I then did some research on how to completely close off the overdraft and I found a way - using the account options on your account. I kept doing this for the past week and the only item I find under my account options is Account nickname, nothing about Overdraft. This morning I called FNB to try and get some assistance but the lady I was speaking to hanged up on me after I was on hold for almost 30 minutes. Why does it take so much to close off the overdraft? I just want it off my account so this is unacceptable. I'm very unhappy about this.