Premature cancelation problem. Vodacom expecting more

I recently bought out of my vodacom contract due to emigration purposes and sent the supporting documents through to the email address provided. A few days later, I received an email to confirm that the premature cancellation was processed and the enquiry was closed. After landing in the UK, I received an invoice and statement. I sent an enquiry to customer service with all supporting documents, to no avail. I am highly upset by this because I am living in another country with an email proving that this has been finalised, yet I still have to fight for good service in SA and fight for a response. I should be worrying about new ventures in my life, but here I am worrying about past problems that according to me have been solved.