As with any repairs, they should have given you the old parts, that said, when you say the radio does not turn on, nothing happens? The dial light or LED displays do not come on, you hear no click or "bump" from your speakers like power is reaching the audio amp, no hiss from the speakers "DEAD?"
If totally nothing, I would wrap it up immediately have it looked at by your "refurbishment" service center...or pay to have it looked at for a small "checking charge" from another local servicer just to get a second opinion. OR since it must be under warranty for 90 days minimum parts and labor, get a return authorization immediately and send it back, only this time demand the old parts back, with itemized list of what they found and what they "refurbished".