Reply To: add to cart button issue

as instructed, i have deactivated all the plugins except for the 3 necessary plugins.

Kindly rectify the following:

upon clicking on the add to cart button the cart doesnt get updated, it is updated only upon manually refreshing the page

for delivery fees calculations:

i have a minimum order for Rs.1999 upon which the order is eligible for free delivery, below Rs.1999 there is a delivery charge of Rs.199
do when the cart value is below Rs.1999 it shows a radio button of delivery charge Rs.199 however, when the amount is above Rs.1999 it shows two radio buttons one for free deliver and another for delivery charges Rs.199. here how can can i show only one option as per the condition of cart value.

Also can i show the total savings Rs. XXX on the cart page ?