SICK AND TIRED OF CALLING ABSA DAILY

I'm extremely annoyed with ABSA credit card division, I had paid up my credit card in November2015 and my card has been in credit since. I have requested a paid up letter since im purchasing a house as it it required for the bond application. I've been requesting this letter for the past week and daily I phone and im told it takes 24-48 hours and this has been a full week with nothing received. I'm annoyed and I don't know who to turn to as im told the correspondence division doesn't have any contact line. I need this letter before close of business today or I will be taking this matter further and ABSA will have to pay for my phone bill as it is costing me money to make these daily calls and also stress. Today I called and 2 call center agents dropped the phone in my ear.