Explain what you would do upon receiving an email like this?How would you handle the issue internally?

Here is an email from an angry customer:

Have the Talking Angela app on my iPad, my daughter aged 3 loves it but have concerns. More recently when you get the opportunity to ‘earn’ the blue diamonds on start-up on the terrace you need to play a sponsor’s video.understand that you rely on these for financial reasons but who decided that it was appropriate that my daughter could watch Walking Dead gaming ads or even those for Scottish whisky!!.?? WTF!!
Now do not let my daughter click on those diamonds and collect them when she’s not around.would delete the app if she didn’t love it so much but thought ask which idiot at your company feels this content is acceptable and would they want their young child or niece exposed to such content??
Get a grip and sort yourselves out because regardless of revenue income this is not acceptable considering your products are aimed at young children.
Yours a very pissed off customer.Explain what you would do upon receiving an email like this?How would you handle the issue internally?Provide a draft of a reply to this angry customer.Explain the time frame that this would happen in.