Bad customer service in the cancellation department.

I prematurely canceled my account with Vodacom before moving to the United States of America. They recently deducted money off my bank account. I followed up with them to hear why they deducted money. Turn out they never canceled my account but credited it with the amount I paid them to cancel it. I phoned the cancellation department again to cancel my account and to refund me the money that they took from my bank account, the person on the phone could not help me and said to report it to a team member. I still have not heard anything back from the cancellation department, and they still haven't paid me back. Not following the request to cancel the account is extremely poor customer service since I made sure to follow all the necessary paperwork and steps to cancel my account with them. I have tried to email Vodacom Cancellation several times, and they have not responded to any of them. I have phoned and asked to speak to a manager, but they will not assist me. I am very agitated that they haven't canceled my account with them and deducted money from my bank account. The cancellation department should know how to handle these situations and that there should always be someone in a manager position to help the customer immediately.