Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if you have already paid , we will refund you the full amount , including any delivery costs charged . 

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