Faulty account

I gave up and cancelled my account at Vodacom at the end of February 2017. Vodacom even cancelled my vodacom e-mail address the day after I send the cancellation e-mail. As my contract only expired the end of May 2017 , my last debit order went of on the 1st of June 2017. After that Vodacom keep on sending sms that I am in arrear. I visit the shop at Savannah Mall in July to inform them that it is not possible that the account is in arrear. I paid the amount if R1528.20 ( whitch is not fair) but I need a data contract. Vodacom keep reject my application. I need help !!!!