Contact form on my Wordpress site

I have two problems that I need fixed 1 on my contact form on my website it says that you can upload a jpeg but when people try to upload a Picture they often get an error message I likely need a different form but I'm not sure. I have contact forms on most of the pages of my site 2 I have a capcha system on the forms but I don't think it's working. I get a lot of spam emails every day that appear to be coming from bots. I Ned this to stop ASAP