Can never get assistance from a call centre!

I have paid off my Nedbank personal loan and need a paid up letter for this, however when I call the hold times are so long and seeing that I also have to work, its impossible to stay on the line for so long. When I finally get through to someone, they place me on hold and then the line gets disconnected. The last person that I spoke to said that the account was still open, ( ref for this call ***) and that I should wait for a few days and call back. That was on the 06/10/2015. I called back today and Ndumiso that I spoke to said the systems were off line and that my account was still open. She placed me on hold and the line got disconnected. All I need is this paid up letter, as I would have peace of mind to know that this account has been settled and that I will not have anyone calling me in the next few months stating that I still owe money on this account. I also want to pay my credit card off as well but I am unable to get the correct account details to transfer the money into. If I call the card lines, their hold times are also quiet long and im transferred from one dept to another. I just need help with settling my accounts without having to deal with all this hassle.