Still waiting on Paid up letters of settled personal loans

I contacted Capitec to enquire for settlement discounted amount for my loan. They sent it via email 2 weeks later. I paid the one account on the 25th October and the 2nd one on the 29th October. Note they say you must wait 5 business working days for the money to reflect their side. As I made payments I sent proof of payments to the email address they provided. To date I am still waiting on paid up letters and for them to write off the balance of the settelement amounts. I have contacted them every 2nd day and conveniently the calls gets disconnected mid conversation. This is not how you deal with customers. I want my paid up letters ASAP and balances to be on zero as it should be written off!!!!