Return phone or get a charge????

[finesse]

so way back in june, i was having problems with my phone. i talked to someone and they sed they were going to send me a replacement phone (same model). got that phone...it didnt work right either. they sent me another phone (different phone) that phone was jus stupid compared to my original phone. i called back and asked to get yet another replacement (of my original phone) they gave that to me and i sed eff it and sold that
phone to buy a mogul . anyway, the gal sed that if i dont send the phones back...(3 of them) that they were gonna charge me the cost of the phone. thing is....they never did. at least not yet and its been 2 months. Do you think they'll charge me? im kinda strapped for cash and might have to sell one of the three (i have insurance so i dont need a backup too much). and cud i get in trouble with sprint? i mean, i even called and asked customer care if i owed them anything and they sed i dont. if yall cud hlp me out i'd appreciate it. thx.