Hi,
Please advise that we have received your letter.
I dislike the formulaic aspect of this phrase. However, when I said This is wrong... It makes no sense... here is what I particularly had in mind. I think the writer meant to say this:
Please advise that you have received our letter.
After all, how can you advise that we have received a letter, how would you know that? As I said, it makes no sense.
Best wishes, Clive