Can my landlord raise the rent in NSW?

Yes, but only once every 12 months, never in the first 12 months, with 60 days' written notice.

Your clock

The rule in NSW

A renewal with the same landlord does not restart the 12 months.

What to send

My notice is dated [date]. The last rise was [date], so I think it is invalid.

Who to call

Where this comes from

General information, not legal advice on your situation.