Disgustingly bad service I have ever experienced!!!

After about a year that I have spoken to vodacom and told them I wanted everything cancelled and paid them the last money for the last contract in March, they phone me last week to tell me I owe them money and there is 2 active accounts!!!!! How is this possible!!!! First they converted my number to another number because they didnt want to cancel the contracts and now they never cancelled it!!!!! I refuse to pay them anither cent as they didnt cancel my first contract either after i paid the outstanding balance on the contract but to find they still debit me as well!!!!I mever even got that money back as someone wasnt doing their work and never cancelled it!!!!