Complaint Review: ionlineorder.com

After clicking on a link for teeth whitening products, I was lead to a website with a "hidden coupon" for $20 off of my first order of Celebrity sexy Teeth.
I found the coupon and ordered within the time frame that it gave me.They were also offering free shipping.
The order should have totaled $ 79.99. Instead I was charged $104 and there was no contact info to cancel the order and no "required" return form to print out.
I assumed this was an legitimate site but evidently not.
I am afraid to send the product back for fear of not getting my refund or the benefit of the product.
There was also no info. on the invoice to help with contacting the company and it is "100% guaranteed" or your money back. Any suggestions?

Claire
Reisterstown, Maryland
U.S.A.