Magento Contact Form Correction With Captcha

I need someone expert to look at the contact form on the website, website is currently using contact form at 2 places, contact page and product page. 1. Check Both contact forms having V2 Captcha working correctly , correct fields old coder used it for debuging, once the form is filled it should show "Email Sent" Message. As you know google recaptcha V1 expired i hired a coder which has updated to V2 but he has some personal issue that's why he left. After update when we enable the contact form lot of spam come and when disable the spam stop , so there error is some where in contact code The previous coder also installed smtp extension to send magento emails through SMTP you also have to check and make sure it works correctly. I just don't want any spam come to my mail box.