Captcha settings

Hi, my web hosting company recently told me that the ‘catalog enquiry’ feature i.e. the button people click on to send an enquiry about a product had been ‘hijacked’ to send spam emails.

I did not have the Captcha feature turned on and have now turned it on to try to stop the spam emails but I noticed that the Captcha feature is different to the Google Captcha feature I am used to… i.e. the Catalog Enquiry asks the user to enter a code which appears in plain text in the web site versus (Google) which uses a ‘pick images that match some criteria’ method

Is there a way of making the Captcha feature in the Catalog Enquiry use a similar Captcha method as Google instead of a plain text code?

I am told that it might be possible for a hacker to programatically read the plain text code and start using my web site to send spam emails again.

Alternatively, is it possiblele for me to use a different forms plugin as I have another plugin that uses the Google Captcha method.