Inside your Seller Central, anything that happens is your responsibility

If you are dealing with a marketing agency make sure they are not emailing your customers using the Amazon internal email

All customer information you get inside your seller central is private and confidential information and you are not allowed to share it with any 3rd party website

Make sure to listen to the whole Amazon Podcast

Quin Amorim, Host of Amazon FBA Selling Online Podcast

If you need Amazon FBA Account Management go check out my Amazon FBA Agency