Debug our modified Contact Form 7

Hi Freelancers, We had a modified contact form (Contact Form 7) to show a custom message and progress bar which it work wonderfully but in the process - we recently discovered the form have bugs: - Staff can still submit forms without fill required fields. If people skip required fields - we will not receive any form and people will not know because there is no error message to pop up to let them know they must do required fields. For that we received calls from staff to enquiry about the status of their submitted forms. - User cannot receive the acknowledgement emails to confirm their submission Would love to have these bugs fixed so we can have 100% working contact form. Would prefer to go with freelancers who worked with contact form 7 extensively before. Am willing to pay up to $50 for this project. Thanks!