Hi @goody66,
some things you might try:
? Check if mails are sent properly (not using contact form)
? Update WP / contactform 7 (if not latest)
? Share your config of CF7 so we can have a more dtetailed look and/or how you implemented it (in template / shortcode / …)
Would also be interesting to know what you changed in the past days. WP updates, PHP version updates, etc.