Has my website been hacked??

I have a website where customers fill out prospective client sheets...My website is built on Wp. I am not a web developer and do not have much website experience... After some time I noticed a couple clients saying that they had already spoken to a salesperson yet I didn't call them... I believe my prospective client sheet is being directed to my competitor. Site Lock said this is very hard to detect or find out (After I paid them their service charge of course).... Now I'm left wondering what is going on.. Are my forms really being sent to my competitor? A client INSISTED they did not inquire with my competitor... What do I do? Any Ideas of whats happening?

You're saying your site is based on Wordpress, are you using a plugin for your forms? If so, can you check the settings of said plugin?
If you're using custom code, you will need someone to look into it directly.

I know I am using a plugin but to be honest my web developer skipped out a couple months back

I think he may have re directed the forms to his website through the plugin.. is there a way for a forensic computer analyst to figure that out?

Have you considered looking into getting a talented freelance coder to check this for you?

My competitor was at my office when I had my computer open and logged into my WordPress. (At that time I had access) once again he is VERY computer savvy... I had to step out for 5 minutes with him in my office... I think this is the time when he may have went into the plugin and redirected... how do I find out if he did that.. remember now I have no WordPress access to my site.