Unresolved billing issue

On 11 February 2016 Mivuyo Mfinwana send us a quotation (ref 009L-L1BF) to terminate our iPad contract prematurely before 7 August 2016.<br> The amount came to R2688.72 which included 6 months instalment and 5 months of airtime subscription.<br> The end of February we received a call from the call centre saying that we had to pay another instalment of R465 as it was for February and was not included in the quotation, we did not agree to this but paid the R465 as we could not resolve the matter with customer care and they told us that it would be the last money we had to pay.<br> We received our bill around the 10th of April 2016 showing R463 outstanding, we did not pay it with the cell phone bill as we assumed it was the R465 we paid in March to clear the account.<br> We made another call to the customer care on 20 April 2016 after they cut the cell phone line and once again we were told that the R465 had to be paid as it was outstanding from March. We went into the Vodacom shop at Key West where Mitchel tried to assist and we called the customer care again, we spoke to a black man but could not resolve the matter, when my wife tried to get his name he put the phone down in ear. Please assist