1. IF Transfer Fee (Share Transfer Premium) is earlier fixed at 25000/- (as per Govt. directives), THEN any further resolution for extra Transfer Fees and/or Donation, is illegal and infructuous.
2. Your Transaction got completed in 2018, which is before March-2019, which is evident from the Agreement and you are in possession of the property and as well paying the Society Service charges since possession date of 2018. Hence new resolution for extra payment is not payable.
3. IF the Society refuses or harasses further, THEN you have an positive option to file a grievance petition against the Society, in the local Consumer Court, for their illegal trade practice, negligence, deficiency, harassment, intimidation, cheating etc.... with proper documentary evidences and you can claim damages /compensation & interest, for your physical & mental trauma.