If i trade in a ps3 can i get gamestop credit on a gift card?

recently gamestop changed their policy that they cant say how much a game is worth over the phone so i went and they said that i have to spend all of my money on games and not put anything over 10 dollars on a gift card that i already had or give me a new one. Is this true? they have scammed me multiple times (charging me normal halo reach as legendary, putting 2-4 reserves on my reciept costing 10+20$ that i did not want and they didnt even mention. I even think they sold me a used hacked xbox because the batteries were already in the controller and it said i had 3 trophies from 1970 (if you have a solve for the 1970 problem please tell me)) the only thing they have done good is be lazy and gave me 50$ for little big planet because they selected the combo pack. I am not going to use them again and i would like to know if the thing about the gift card thing is true because i have about estimated 250 credit that i will get for trading in all of my ps3 stuff (was a huge fanboy but i got an xbox and only play that and i will be doing alot of stuff this year and wont have time for 2 systems) also can i trade in move controllers, navi controller, ps3 eye, duelshock controller, bluetooth headset, and rockband controllers?