I don't know anything about this website 1000msp.tk but this is my experience:
My son received a message on his xbox 360 to go to this website for free Microsoft points.. so he did ...it asks for your xbox 360 live sign in and password... which of course he gave so they could redeem his points to his account... well I got 2 charges for 62.50 in a row..and of course he did not get any points even though i paid...thank goodness xbox caught this... what it does is get the sign in info.. and most people have their credit card info stored so they don't have to enter it everytime and accesses your info... and you incur fraudlant charges.. and this hacker gets the points ..so in the end watch your kids on the xbox 360.. I have already gotten refunded and I hope nothing else happens... stay away from this website... peace!!