OET mini writing test: Is this opening line right or wrong?

In this super quick OET writing mini-test, we'll take a look at how a candidate started their OET letter and decide whether it was right or wrong and why.

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[saminaa]

This is known case

Discharge letter not referral letter
Candidate wrote referral letter

[Jaded]

i am writing to discharge mr. ali, back into your care after treated with pyelobephritis..