Like the bro said above.
Once they plug it in and see that you installed the ipad bb they will give it back to you.
They updated the hardware on the newer 3GS phones so if you try to install the ipad bb you pretty much ruined the phone.
Only option to receive a replacement would be to pay up the $150 replacement fee but who knows if they will go for that either.
Next time listen to your dad.
I dont think you're getting it.
You messed up the baseband. That's what is used to make phone calls and connect to the network. Its not the JB, its the ipad bb that you installed on an incompatible 3GS model.
The baseband is done.