Bharathiar University — Marksheet correct correct request submitted to COE PG section

I'm Gunasekaran, I did my M.Sc in Bharathiar university department 2003. Last month i applied for marksheet attestation for WES. While attestation, COE PG section, informed me that need Grade correction in the mark sheet. I travelled from Chennai to Coimbatore applied for the market correction and given my original marksheet on 27 Apr 2020. While applying for the correction they said it will be done in a week and give a call and inform me. Waited for a week no call, then called the COE PG section everyday, so far i called 30 times, every times they used to tell that Sir is on leave or Sir is not on his seat. I'm waiting for almost one month, I haven't received marksheet yet. One lady in the COE PG section saying that mark sheet is ready, Sir (Nataraj) has to sign it. Sir (Nataraj) called me, he is saying govt office will work like that, you completed in 2003 it will take time, marksheet paper is not available for printing so and so. I don't know where to inform this, no other options daily i'm calling the COE PG section, so far no hope.