refund surplus and make up short
这个短语不大好翻译，老外不这样说。一般说 balance will be paid to either side 就可以了。
楼主那个back much little repair 是从哪里找来的？绝对不能用！
多退少补 [duō tuì shǎo bǔ]
基本翻译
The balances will be paid to either side as the case may be.
return the overcharge and demand payment of the shortage
refund for any overpayment or a supplemental payment for any deficiency
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