Indira Gandhi National Open University — My assignments status are not updated yet

I had submitted my assessment in the month of may 2021 through Google form link which was provided by my regional centre and I had received my submission receipt as well but still it is not updated they had not informed me why and what they're are doing
I had mailed them but they are clearly denying that they had not received any assignments of mine I m really very confused to what to do or what not to do please help