Poor service from Nedbank

I have paid the balance of my credit card on Monday 22 February 2021 and I still haven't received any paid up letter after phoning numerous times, the call centre agents keep telling me they will call me back but they never do. I am in the process of buying a house and I really need this paid up letter your employees have provided me with very poor service and is holding up the whole process and complicating my life. When I opened the credit card it was a painless process quick and easy but now that I am cancelling its a headache this is unacceptable service. The agents and bond orinigator are getting irretated already because nedbank is not doing anything im waiting 3 days for 1 letter. I will never open any account at nedbank ever again this is becoming ridiculous.