uscc mogul upgrade question

[JAEPILLA]

ok long story short, i had a mogul btw us cellular is my carrier, i hacked the phone and put on the sprint rom so i could have gps, the phone broke, signal denied my insurance claim because of hte way it happened, i took the phone in to us cellular and rep there gave me the number to a us cellular blackberry support basically they agreed to send me another phone (of course i have to pay a 85-125 fee for the switch) and i have the send the broken phone back to them, but rembmer i hacked into the phone so it doesn't have the us cellular rom anymore.. they said they would use it for parts if it was possible.. so will they eventually detect that i messed with the phone and somehow charge me full price later on?