Stock exchanges have revised circuit limits for Paytm owner One97 Communications after a steep price crash caused by RBI's crackdown on Paytm Payments Bank. The upper limit is now at Rs 535.75 and lower limit at Rs 438.35. The company is expected to face a worst case impact of Rs 300-500 cr on its annual EBITDA, but aims to continue improving profitability as it reassures users and holds events.