Vodacom, my worst nightmare

I have upgraded my data contract from 3Gb to 10Gb online and within two days of application, i requested for it to be cancelled and i received sms notification that it was cancelled Beginning of May my accounted was loaded with 10Gb, i contacted customer services to query it and even today am still struggling to get this contract/order reversed. Every time when i call i get different stories with no help. Now am forced to pay and be on this contract for the next 23MONTHS