To appoint an new auditor, first the existing auditer resigns...

To appoint an new auditor, first the existing auditer resigns officially, and then the new auditer is appointed.

Its normal stuff, the same thing happens to many stocks as soon as they either, dont require such a high profile audier any more, or if they simply get offered a better deal by a different company.

So is may say they resigned, but would have been asked to resign etc.

Its just official blerb, Many companies do it if they find a better deal for the services.