National Institute Of Open Schooling — error in secondary school marks statement

I had appeared for secondary school examination held in april 2017. My roll no. Is[protected]. There is an error in grades awarded in the marks statement issued to me. Marks scored in social science are 76 and grade given is c. Likewise in other subjects also different grades are given.in case o[censored]rdu for 72 marks grade given is c. For english -59, indian culture-56, science & tech-56 and maths - 53, grade given is e. Actually there is no grade after d.
Kindly issue me a new marks statement with correct grades and oblige.
Please let me know by mail about the issue of marks statement. Otherwise i have to miss my college to run around the study center which functions between 9 and 11 am and is also far off from my residence and college. If it sent to residence by post as books were sent earlier, i will be much grateful.