The screener Pro trial lasts for 14 days - after which, it gets automatically renewed for the next 1 month at a fee of Rs. 100 + GST (Rs. 18)
At the time of signing up for the free trial, the auto renewal is mentioned in the terms and conditions as a disclaimer.
Note: If you want to discontinue using screener Pro, you may end your plan anytime before the 14-day trial period expires. More about this here