These two support guides are good starting places:
If those guides do not help you, please send us the following details:
The URL for your live form as you want visitors to use it
The URL of your deployed html form. In case you have a javascript form, we need to literally be linked to the html version you’ve deployed, as mentioned above (look for “pure javascript form”)
The form name that you’ve set and that shows in our UI (if it shows in the UI)
Any errors or logs from the Netlify build logs, dashboard or browser developer console
Description of anything you have tried that did or didn’t help or make things better/worse