I wouldn’t use either of these sentences as both are likely cause offence to a customer, in that both make the enquiry in question sound as if it is potentially a ridiculous enquiry in the first place. A better option might be: “Kindly advise if you still wish to proceed with your enquiry” or if it refers to an enquiry made of a third party then it would be “Kindly advise if your enquiry is ongoing”

I think relevant sounds better. You tend to talk about arguments being valid.