Poor service from Private banking

I phoned FNB private banking this morning 13 December 2017. I spoke to an unknown banker who submitted an overdraft application for me. He said he'll phone me within the next 20 minutes but did not. I just called FNB to follow-up and was told the application was completed incorrectly, I had to resubmit the application after about 10 minutes I was told I could only submit an application after the 17 December 2017. I cancelled my loan application because the private banker adviced me incorrectly.