Now this might be helpful...
I have deactivated the Jetpack form and installed clean-and-simple-contact-form-by-meg-nicholas. It works.
That said, Meg's form has this simple shortcode
[cscf-contact-form]
and this is what I had for Jetpack's:
[contact-form][contact-field label='Name' type='name' required='1'/][contact-field label='Email' type='email' required='1'/][contact-field label='Comment' type='textarea' required='1'/][/contact-form]