[INST] Write a function to convert a given string to uppercase unless it starts with the string "Rejected"/n [/INST]  ###Response: Here's a Python implementation of the function:

```
def uppercase_unless_rejected(string):
    if string.startswith("Rejected"):
        return string
    else:
        return string.upper()
```

This function first checks if the string starts with the substring "Rejected". If it does, it simply returns the original string, without any uppercase transformation. If, on the other hand, the string does not start with "Rejected", the function returns a new string which is the uppercase version of the original string.