Perhaps you should look up the definition of fraud before you complain about it. You did a survey that entitled the company to call you for follow up. Therefore, by doing the survey you gave consent to having your number released. So, nothing illegal there.
Next, the lady who spoke to you on the phone is required to follow a script. The script clearly indicates that a student will be asking for your opinion on the tristar when they drop off the free gift. No surprise there. If they didn't tell you that on the phone, students would be kicked out of houses every time they got there.
Next, the student did the demo for you and you recieved your free gift. Nobody forced you to buy anything, which you didn't.
So please, enlighten me: which part of obtaining your number legally, clearly indicating what will happen when you get your gift when you recieved the call, and reciving your free gift (which you agreed you did recieve) is misrepresentation or fraud?