Hello Nataša,
let's face it; most of us have had bad experiences previously with online businesses.But,we kept on searching for the right one.And we found SFI.Without those bad experiences maybe we won't be able to recognize it.
Tell them about your experience.If they can identify with you they will trust you.Then tell them about SFI.It's your belief and enthusiasm that will convince them.
I hope you'll find this answer helpful and wish you a lot of success.