Bad service yooo

I called them on the 22 of May inquiring about amount that I'm owing regarding my overdraft that need to be settled. I spoke to Sylvia she sent me settlement amount to settle. And after she promise me to send me paid up letter and update with their client that they collecting on their behalf. Today I called I advised that I didn't get any email regarding payment and she insisted that she send me a letter of which I kept on telling her I didn't. I don't like the way how she treated me dropping the phone when I'm asking at the end I am a client. I need some info as what is gonna happen as they are the people holding my account what is it so difficult to provide feedback by doing that she chose to be rude to me I don't like the level of service she provided to me I don't like her rudeness. If I say I didn't receive email I must now lie to make her happy pls provide someone who will be willing to assist me not her. Her name is Sylvia David's I don't like her attitude at all

My contact ***

Thanks