Rectification u/s 154

Dear All,

We received an intimaiton u/s 143(1) and filed an appeal for rectification u/s 154 for one of our client.The appeal was rejected by the Centralised Processing Center,Bangalore.What should be the next step?We tried uploading rectification xml again but that cannot be done as the income tax site shows an error and displays a message saying rectification has already been filed,wait for CPC response.The response has already come.What should we do?

Regards,

Fatema