****ty accounts department

I settled my account in full and need a letter that my account was settled in full...urgently. They keep on telling me it takes 5-6 days for the money to reflect in their account and then the settlement letter takes 48 hours, I ask to speak to a manager, they put me on hold for ever. The letter they sent me after promising me I will receive it in 30 minutes, was the letter showing the amount I must pay to settle the account... BUT I ALREADY SETTLES IT YESTERDAY!!!