These villains are not so shrewd. Stupid are the people who cannot see through the villains. At least they should have seen through Radha or thrown Paridhi out at the outset. These villains are not so shrewd at all. It is Modi Bhavan people who should have been smarter and caught these villains then and there.
Checked Radha's phone records. Or seen through her numerous sabotages.
At least Urmilabehn they knew she was doing lot of kalaakaris. But Radha they blissfully let her do so much crime.
They let her stay in Modi Bhavan even after Gopi left without suspecting her of doing anything.