Nios, D. El. Ed Section — surname correction in admission record

Sir, i am tuku mandal unfortunately i have been entry my surname as mamdal, which is wrong entry, i also mail more and more to nios - d. El. Ed correction section, but until not corrected my surname. So, i request please take necessary action to correct my surname in nios, d. El. Ed admission record. My details is given below:
Name - tuku mandal enrolment no - [protected]. Ref no - d[protected]. Email - [protected]@gmail.com, mob no - [protected].