Incompetence !!

I,purchased a vehicle and had it financed through wesbank in 2005/6 , account no then ***. Due to unforceen circumstances in 2009 with 4 payments left and a balloon payment of R24000 I found myself unemployed. I found work in April 2010 and app**** for debt review. The account was placed under debt review and a monthly sum of R1100 went to this account. In June 2013 I was contacted by wesbank and told the account was in arrears! Subsequently it was then discovered that WESBANK only THEN realized the account was under debt review and changed my acc no to ***. All the \ arrears "money was then transferred from the old acc no to the new as it was being paid into the old acc by the NPDA. At that time I still owed around R6000.00 but according to wesbank R18000. The payments has since been **** like clock work and the account paid up.NOW AFTER 9 months wesbank wants to claim there is still R7000 outstanding???? I bought a polo not a Ferari ..."