In reply to:

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After a couple of weeks of speed issues, and constant requests for me to "call back in 48 hours" I requested that my account be closed so I could migrate elsewhere.

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Maybe they misinterpreted your request as a cancellation because you mentioned closing your account.

Should just have asked for a Mac code. If they then mention closing your account you have to firmly state you do NOT want this.

Closing the account is done automatically once your new provider has provisioned you with the Mac. But of course its always good practice to call them to confirm.