You may need to deactivate the forwarding of feedback alerts for one or more of the solutions (eg: cable solution) or stop the alerts from being sent to any of your users' email addresses.
Any changes on the list of users who receive feedback alerts can only be made by creating a change request. Please talk to your account manager to perform this request.
If the customer opens a Support request for this, then contact the customer's account manager using the steps outlined in the Handling Change Requests Outside Central Support's Scope of Work article. The account manager will handle this and if needed, will involve the Professional Services (PS) team (a.k.a. Config team).