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