UNAUTHORIZED MIGRATION

I have a contract with vodacom, a consultant contacted me on 4 May & offered an upgrade on my current package. He said I have until the 1st of June to accept or cancel. On 29 May I called to cancel the migration, the lady i spoke to said it will be canceled. On 1 June I was migrated to a higher package. When I call them & tell them I canceled the migration, their response is that in order to cancel I must pay a penalty fee for a migration I didn't accept. Vodacom is a ****. They ***** from the poor.