Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
refunds can not be claimed for any partial-month subscription period . 

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