Margin requirement & Haircut

Lets say I pledged Rs 1 Lakh worth of UPL shares couple of days ago to get 80K margin (approx 20% haircut). In a scenario like yesterday, when UPL fell 10%, what happens to my margin. Is it automatically revised to 72K. (80% of 90K, worth of my UPL position after 10% fall) or do you guys wait for sometime for margin call?

Revision in collateral margin will happen at the end of the day, based on closing price and haircut of the scrip.