A. In my opinion, BBMP has approved your project which you bought from the same, usually OC would be rejected if the builder has committed mistake more than 5% deviation in this task. It has an exception under the bye law 6 of the BBMP that within 5% deviation can be permitted by to issue OC by paying a penalty as per the slab of the BBMP. Hence, OC cannot issue by paying betterment Charges.
B. The Hon’ble Supreme Court has given a judgement in Faqir Chand Gulati vs Uppal Agencies Pvt. Ltd. & Anr on 10 July, 2008 that “Even if such a provision for providing completion certificate is not found in the agreement, the builder cannot escape the liability for securing the Completion Certificate and providing a copy thereof to the owner. The law requires the builder to obtain completion certificate of such a building.”
C. File an application before the BBMP under RTI to know the proper reason to reject to OC?. You will not have right occupy the premises as per legal norms unless obtained OC from the BBMP. But the BBMP has the right to demolish the building when the rules and regulation and approval plan violated by the builder.
D. The Karnataka High Court has given a stay with respect to land regularization under Akrama and Sakrama. The notification under Akrama and Sakrama proposes to regularise deviations up to 50% in residential buildings and upto 25% in commercial structures.
G. Issue legal notice to the builder to apply or provide OC. Thereafter, you can approach the Consumer Forum to obtain relief under deficiency in Service. Don't think about the demolish go exercise your right before the court of law.