invalid application please help me out

[mailmefren]

I applied for extension on 8th April, HO received it 14th April acknowlegement received on 18th May 2011.Today 17 May they returned application and documents as "INVALID APPLICATION" due to wrong visa fee.
What should I do now.Is it acceptable if I do another fresh application ? Please note my visa already expired on 12th April. Do I need another CAS if I do another fresh application ? Can I do premium service or I can apply only by post.

Please help.

[geriatrix]

you need a new CAS

Yes you need to make another application.

You are unlikely to get an appointment for the premium service and also that is only for straightforward applications - as you are now an overstayer it will not be straightforward so you should apply by post.

[geriatrix]

yes - correction - you should not need a new CAS if the application is rejected as invalid because the application is treated as if it never happened. However you should check with your institution that the CAS has not been marked as used and is still valid. If it has gone to 'used' you need to get a new CAS.