1. You should have filed a suit for mandatory injunction to demolish the wall, and not done it yourself. Be that as it may, the folks on your side have to emphasize on bail alone at this stage. Since it has been denied thrice it is unlikely that it will be granted now unless there is a change in circumstances. Obtaining bail in a prosecution u/s 307 is always an uphill task.
2. If you have not moved the High Court for bail then you may do so as in such cases the bail is ordinarily refused by the courts subordinate to the HC. Everything hinges on the FIR and the material collected and presented in support of the allegations.