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I took a cellphone contract with Vodacom, my 24 months of paying was suppose to end last month because i ddnt upgrade for another phone, this month dey deducted money from my account and when i called them they said they assumed that i still wanna carry on paying so that i can get airtym, so my question is, why are they still deducting money from my account because my 24 months is finished and i ddnt upgrade for another fone