Getting permission to use Material - Further

Last week, both Romina and I emailed the management of singer's 'Yuna' and 'Charli XCX', in order to get permission to use their songs as an accompaniment for our pop video. However we have had trouble receiving replies from both of them, therefore we emailed another artist's management, 'CHVRCHES', and asked for permission to use their song 'Gun'.  Fortunately, we received a reply straight away and were given the opportunity to use the song for our pop video! Here's a screen
shot of the email we sent and received: