5TH SPRINT REPLACEMENT... WHAT DO I DO???

[puff601]

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Hi guys, i really need help/advice. ok so i have a sprint and i just got my 5th replacement through advance exchange today... my 3rd replacement this month... each fone i get freezes at times and i have to remove the battery. this happens 3-4x a day... i was on the fone with sprint all day yesterday and they kept saying they wont do anything about it because im past my 3rd replacement.after several more calls, someone finally sent me another replacement. a supervisor said i called 28x yesterday and i guess they still dont understand i am having serious issues here... does anyone know someone i can contact at sprint to have this resolved? i just want a fone that works, preferebly a different model. ive heard everything from there is nothing that can be done, use my upgrade, call asurion, hung up on over 5x, etc. they act like i am sending in for replacements just for the fun of it... i have read online about people that have these probs with sprint and they have done stuff like credit their account for the full price of the problematic fone or just giving them a free fone of their choic but i cant seem to get any resolution at all... ive even threatened to cancel my service but they dont budge or they hang up on me... i just want a fone that works, can someone please help me? i would really appreciate it. thanks