Pls, seriously i do need help(mystery shoper)?

I was given a job as a mystery shoper, and i was given some amount of money,close to five thousand dollas, and was told to clos to 4500 to someone in CA by money gram,and buy a product that cost about $50 or less which is mine to keep,but all i just had to do was to write a report of what i bought, and also about the product, and fax it to them.and also keep the remaining change as my salary, and that if i did p the training, i would be given a permament mystery shoper and that my next salary would be more than the first. I did finish the survey, and wrote a report of how i sent the money to the addy. of the person that i was ordered to send the money to. What's bothering me, is that i'm so afraid, my dad di tell me that it's all a scam, and that they won't send me another research, i'm just so confused, bcos he also thinks that it might hurt me later bcos it is too good to be true.Does anyone know anything about being a mystry shoper, and is it a scam,even though the money is real?