Thanks Cyrilroy. So now we know that Mr.Vashishth and Mr. Sharma do not have the power to change the rule. And Mr. Bhushan may be able to do something. So the letters must be addressed to DGCA and a copy of the same be sent to Mr. Bhushan.
What we can also say in the letter is- When we commenced training Duchess BE 76 was registered in India and was accepted by the DGCA. Till date according to the DGCA website,
VT-EJR is registered in India and doesn't say anything about the cancellation of its C of A.
You may save that page of
VT-EJR for record.