I will call you back (but actually I will not)

I have a Sanlam insurance policy that was cessioned to Nedbank Home Loans. My home loan is paid off and the Sanlam policy has came to completion (Already a year ago). So, Sanlam cannot deal with the policy as Nedbank has the cession. The easiest thing in the world is to ask Nedbank to write a letter to Sanlam, asking them to cancel the cession. OOOO and by the way, when you write the letter, PLEASE sign it. (is that not normal?) How difficult can that be? OK, call ***and talk to the help desk of Nedbank. No, send a message with the info to ***. (nice request from Nedbank). (Reference number ***5) Done many weeks ago, so wait wait wait... 6 weeks later, call *** again. Where is my letter? "O sorry, forgot to send it" So I received the letter and forward it to Sanlam. (Reference number ***4) 3 days later, Sanlam flagged the problem that there is no signature on the letter Nedbank supp****. Call *** again. "Please can you put a signature on the letter?" They (Nedbank) cannot do it now as it is almost time to go home. They (Nedbank) have my phone number (I approved their request on my phone number so NEDBANK has the correct number) and they will call me back. That was Sibusiso from Home loans dept. The reference he gave me was ***5. Two days later, I called again. Sibusiso didnt call me back. Someone else will help me: I think it is Trevor Quala. He needs to talk to NEDBANK supervisor about request and will call me back within 30 minutes. It is now 3 hours later. No phone call yet from NEDBANK. Every time I make a call to ***, it takes 30-60 minutes from my life and I am not moving forward. I have spent quite a few hours with ***. How to get service?