Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
in the event of an error , we reserve the right to correct such error and revise your order accordingly ( which includes charging the correct price ) or to cancel the order and refund any amount charged . 

```
. OPTIONS: ['None' 'Unilateral termination' 'Content removal' 'Choice of law'
 'Jurisdiction' 'Limitation of liability' 'Arbitration'
 'Unilateral change' 'Contract by using'].