Does it important to complete BGV of all Offered companies?

Hi,

Sry am new to switching. I am confused after securing offers, companies starts to force call to complete BGV by EOD everyday.

I am really confused if I can really do all BGV from my side for all companies and before my LWD will think to go with one. Is this fine? Or I shall not do BGV.

Response will be grateful to my doubt.

Thank you :)