Settlement Letter Refused to be emailed to me Settlement Dept

I visited the FNB Branch where a consultant at desk 3 assisted me very helpfull. She phoned Debt Review Dept to obtain settlement amount which i can pay to settle the overdraft. The Settlement Dept gave me a settlement amount of R3451.14 which is valid for only the 6th January 2022 but they refused to give me a letter as they said they cannot give me a letter as they not allowed. I am not sure how i am supposed to settle account without having the banking details to pay the money into. Debtbusters told me i can pay FNB straight as this is my last account which i need to settle to get off DEPT Review. I then chatted with Secure Chat to get info what to do now and they provided me with the nr i need to phone ***. i phoned the nr but had to provide my details to about 6 employees as they keep on putting me through to another consultant. they gave after about 30minutes a email address but now i have to wait 3days to get the settlement letter so then the settlement amount they gave me is no longer going to be valid. Very poor service from FNB. I tried to be a client of them but thinknig of leaving FNB as this was so bad service. It doesnt seems like they want their money.