@vegele is that from the upgrade team or the expedite team? they are different teams…We had similar date of documents acknowledged and emailed the expedite team (being overseas and also first passport were not eligible for upgrade). Only response from them was the automated message and then on Monday we got notification our applications had been approved.
This was automated message we got from expedited service (ExpeditedService@hmpo.gov.uk):
We have received your email. Please do not send any more emails as this may cause delays.
We can only consider expediting an application if you submitted your application at least 10 weeks ago
If this does not apply to you, you will not receive a response from this mailbox.
You cannot expedite your application face-to-face at a passport office – please do not visit us.
We are unable to reply to general email enquiries. You can track your application at: http://www.gov.uk/track-passport-application
To get passport information or to find out how to contact us, please visit: http://www.gov.uk/browse/abroad/passports