It used to work but now it no longer has sound! – Learn French for Kids 2+ Review

It used to work but it no longer works anymore. There is no sound both on the iPad and iPhone. I did everything they told me still not working. I even upgraded. Other apps work just fine.I contacted them many times. I get a response from Vietnam, still not helpful and they are not responding. Too bad my kids love this app.
Review by yarra318 on Learn French for Kids 2+.