I watch my cards and pay them off before the first bill. But half a month before the bills due date you will see the score drop. Because you used a card. They do it so that way they lowered your score before you paid off the bill. Oh and when you do pay it, be lucky if they raise it again but it won't be as much as they took from you. Totally illegal..
Tip for consumers: Just don't let them screw you over, cause there is noone to turn to for help when it comes to wrongfully lowering someone's credit score