How to remove my remaining iTunes gift card from my iCloud

Marking your own post as Solved may prevent others from trying to help because they think you have fixed your problem.

Buy something more expensive and pay the balance with a credit card or contact iTunes Support and ask them to zero balance your account. See the Apple Support articles below for contact information.   

iTunes Support – world wide   -

Apple Support schedule phone call     -

Billings and Subscriptions   -

Apple on Twitter