Some people work better with email. They have an email service. So the customer service thing to do is respond to the email if to say nothing more, we are really busy, calling is easier, or, I got your email, I hope to get to it soon, we're swamped.
I like using email. if gives me a place to refer back to in case I forgot or maybe processed the info incorrectly.
Anyway, if they have great customer service, they would be responding to their emails IMHO.
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Nicanor (Ten On The Deck)