Please reverse

II did an upgrade on one of my lines in Dec. There was a migration item listed that they voided and said I don't have to worry about that. When I received my statement I saw that the migration fee was still going to be charged. I phoned vodacom and they said i dont have to worry a credit / reversal has already been put through automatically so that amount wont go off. When vodacom deducted this month's fees however that amount was deducted for the migration. I dont understand this. I phoned the call centre yesterday and was asked if I made an arrangement for them to reverse / credit it, and I said no because the previous agent had told me it was already been done automatically. Can I PLEASE get that money in my account as soon as possible. I did NOT budget for this and I am going through financial difficulties at the moment.