Service tax registration problem

After submitting ST1 form and obtaining ST2, I noted that there was a mistake in my original application. After amending the same on line through "Complete Amend Registration" LINK, when I submitted the form online I got the message,"Your Request Can not be Processed, Please contact the System Administrator.". I attempted the same a number of times with different browsers with the same result. NO provision exist for submitting hard copy of the application. Please help