Karnataka: dc conversion and rtc issue

Dear Sir/Madam, Following is our situation. Please provide your advise. 1. We have purchased sites in a layout located in the outskirts of Bangalore and the land was converted to non agricultural purpose after approval from the Deputy Commissioner (DC) in 1996 2. Purchased sites in 1996 and was registered to us in 1996 3. DC sent a notice to the developers of the layout in 2010 asking them to appear and prove that they were agriculturists when they purchased the land in 1995, produce their income tax returns, and income tax clearance certificate five years before purchasing the land 4. The developers didn't respond to the notice 5. The DC issued an order in 2011 indicating that the developers broke Karnataka Land Reform act of 1974-rule 79 (a), (b), and 80 6. The DC revoked the DC conversion order of 1996 and now in the RTC document it indicates that the land belongs to the government My questions are: 1. How can the DC conversion order be revoked after 15 years? 2. Is it allowed under the law? 3. If we sell the sites, will the new owner's have any issues in the future? How to resolve this issue? We have all the documents-DC conversion orders, sale deed etc. The developer doesn't care as he has moved on to new projects. Thanks.