Account settlement

Writing this complaint with huge frustration. In the beginning of March a consultant called we to offer a 30% discount if I settle my loan I agreed to the arrangement and promised to pay half of the amount and the rest to be deducted on my account. So Wednesday I call to confirm that since I'm done paying the amount as agreed will my account be closed. First consulted seemed unsure what I was talking about and I ended up speaking to 4 consulted all of them seemed unsure.

So now I'm frustrated cause they call us to offer the discount but when if finally time for them to close the account it seems like no one knows about the discount. After I called them they send me a massage that I must send a settlement letter and a proof of payment for them to resolve the issue

1.were must I get the settlement letter cause they are the one who called and offer the discount 2.They always debit on my account they should have a proof on payment on their system

So I'm pleading to African bank to resolve this issue and please train your consultant properly