使用許諾契約書の条項に同意されない場合は、未開封のメディアパッケージを速やかにABC社に返送していただければ、商品代金を全額払い戻し致します。

、、。

If you do not agree to the terms of the license agreement, please promptly return the unopened media package to ABC Corporation, and we will refund the full product price.

Literal

Usage-license contract [attributive-の] terms [to-に] be-agreed-[neg-passive-れない] case, unopened media-package [object-を] promptly ABC-Corporation [to-に] return-[have-it-done-polite-humble-いただければ], product-price [object-を] full-amount refund-[humble-致します].

Corporate legalese / EULA language. 同意されない uses the passive as respectful (尊敬語 usage). ~ていただければ is a humble-polite conditional 'if you could do X for us.' 速やかに ('promptly') is formal. 払い戻し致します uses the humble 致す form of する for refund. A model of formal customer-facing legal Japanese.