Cancelling Vodacom contract online is impossible

Dear Sir/Madam, You would think an "innovative" company such as Vodacom would make it easy to cancel a contract online. Think again. I am not able to phone Vodacom as I am currently overseas. Also, I send Vodacom an email on 6th of May to *** but no response as yet. Maybe Vodacom will get it when there's no money for them next month, unfortunately that damages my credit record which defeats the purpose. Sincerely, Mr. Schoeman