Tcs correction return

one sales bill on which tcs was not deducted. after that i made payment to the government through challan with that particular amount. then i added challan online on traces through dsc. but mistakenly when i requested for correction i choosen 26Q instead of 27EQ and such requests is already processed by department. now i want to add deductee on that challan but there is not showing section for tcs on sales i.e 206C...can i cancel such processed requests???...what should i do to file correctly my corrections as i described above ???

please reply me as early as possible....
thanks in advance....
thanks again