This is unlikely to be a Woocommerce setting, or if it is in the Woocommerce settings, it has been added by an additional plugin from the theme maker.
Check your theme settings, or for a widget that is configured to appear on user account pages.
Since the CSS style .avada_myaccount_user
is being used for this header we can safely assume you are using the Avada theme.
If nothing else, to disable it, you can always add
.avada_myaccount_user {
display: none;
}
to your override.css file if it includes one, or look for this class in the stylesheet and add it.
If you wish to request specific support, go back to the theme maker.
Frankly, bothering the Automattic/Woothemes boys with such questions, I am surprised they were that kind with their answer. Woocommerce is an open source product and thus free to use, but if you want support you have to pay for it, or pay someone else who knows what they are doing.