No Response from call centre

I have tried to call the call centre and due to high number of calls, i decided to drop a call.<br> <br> Back in August 2015, I gave Nedbank notification that I will be selling my property avoiding cancellation charges.<br> <br> On 3 Feb 2016, we received a cancellation figures showing Outstanding Balance of R656835.36. On 29 March 2016, My Attorney paid R674,122.70(more than what is supposed to be paid) into my home loan account settling this account and now it shows current Balance as -R18,479.34.<br> Please I seek clarity on the current Balance of -R18,479.34.<br> <br> Please also provide me with the settlement letter written showing my account has been settled and closed? Also please make sure you stop the next debit order.