Sale Deed Completed But Owner Failed To handover Plan Approval

I am residing at Gudiyatham vellore (district). I got a registered sell agreement for independent building as per the market value of 32 lakhs at the time of sell agreement i paid 3 lakhs as advance balance required to be paid at the time registration. But when i asked owner about Plan Approval he failed to give plan approval. According to the sell deed date of registration have time of 30 days as per sell deed condition if i failed to give balance amount i dont have any rights on said property. Now without having plan approval any bank is not going to give any loan and i cant pay balance amount on due date can i approach legal authorities to cancell said plan approval or to get some additional time to arrange money from my ownre sourses. What kind of proublems i am going to fave in future without plan approval.