Mumbai University — Not giving original Marksheet

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On 29thAugust2019, I have been given a letter from Mumbai University confirming that I have passed my Enginnering Drawing subject under revaluation an

On 29thAugust2019, I have been given a letter from Mumbai University confirming that I have passed my Enginnering Drawing subject under revaluation and asking me to submit the original Marksheet with them so that a new marksheet could be given out. On 11oct2019 I have submitted an written application to the "Control Of Examination" and have submitted my original Marksheet with them at the counter window and they had provided a signature and stamp to my written application.
I was informed at the time of submission that the new marksheet would be sent to my address or my college but soon there was an lockdown nationwide, and hence I couldn't get an update from university regarding my marksheet.
Now when I visited mumbai University Kalina, they are asking me to show them acknowledgement and they are not ready to consider their own stamp and signature given on my written application and refusing to check the records. They are asking me to apply for a duplicate marksheet even when my original Marksheet is with them. I have a lot of hope on this forum that my complaint would be highlighted to the appropriate authority and a resolution would be provided.

Below are the details.
Name - Rajesh Panigrahi
Marksheet - F. E. Sem - 2 (Engg) marksheet
Date of submission - 11oct2019