mo-media.comは安全ですか？

I emailed this company to inquire if they have Veterans discounts, which they don't. Since there where no discounts I placed my order for their Accuplacer secrets books costing $39.00. Since the purchase I have been bombarded with emails trying to sell me more products and claiming their book is not enough. Had I know I would be overloaded with mail I would have never purchased anything from them. $39 is a lot of money to an unemployed disabled veteran trying to return to school, so I am rather offended buy their sales emails and hope when I finish reading the book it will have been adequate to help me with this upcoming test.