He may be able to get out of this for free, since he is a minor he can void any legal contract he enters in at any time. You would probably have to get a lawyer involved to do this, don't know if its worth it for $350.

Another tip, if you want to build his credit. Add his name to one of your cards and his credit will be built as you charge and pay on that card. Just make sure to pay because his credit will go down if you don't...

Getting credit is a freaken PITA as I am finding out now! I have a 740 credit score and can't get a decent credit card! Because I have only had one low limit card, and some student loans. I can see why people buy cars, you almost need to, to get your credit rating decent.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200