Do you need help? Here are some available options to help solve your problems.
FAQ and docs
First of all, check the FAQ. Most questions have already been asked by someone and you can find the answers you need on the FAQ page.
In addition to the FAQ, this official website provides extensive documentation covering a broad range of topics from creating your first contact form to customizing contact forms to meet your own needs.
Checking the FAQ and documentation is the quickest way to solve your problems.
You can use volunteer-based public support forums on WordPress.org to ask questions about the Contact Form 7 plugin. You may be able to find some helpful topics there that deal with issues like yours. If not, open a new topic.
Remember that people who help you on the forums are all volunteers, and no one is obligated to help you. Be polite. I suggest you read the forum guidelines before posting in the support forums.
Sometimes it can be hard to resolve issues alone or even with help from volunteers on support forums. For such cases, you can call for help from experienced professionals.