Put option declining price - Why ?

#1
On Friday (dec 16) market closed at 4650 and today monday(Dec 19) at 4613, Then still why on both days 4700PE closed at exact same 140Rs. ?

Market closed lower today then shouldnt it close 4700PE close higher today as compared to Friday.

Also, as markets are below 4700 mark, don't i earn due to time decay as i have PUT and it's in my favor as market is trading way below 4700 price?