When I have a business meeting in my work, I always arrive early so I am not delayed in traffic. I apply this to when I am on a meet with a SP.
Had this a couple of times when I have texted the SP saying that I have arrived and will be in time for our meeting.
I know text messages can read differently like they come across aggressively, but I have had a few SP text back saying I’m still getting ready and I will let you know when I am.
I fail to see anything wrong with an SP replying in that way - sounds very reasonable to me. It is your message that comes across with aggressive undertones.
"I have arrived" gives the impression that you are standing right outside their door. Have you considered that many WGs might not liking the idea of clients hanging around outside their gaff, particularly for any length of time, as it could draw attention. Let alone the aggressive undertone of "let me in now" that such a message clearly conveys.
But the additional "[
I] will be in time" is the icing on the cake. If you have arrived, then obviously you are in time - why do you feel the need to emphasise it? Are you expecting the WG to be grateful for you being on time? By emphasising that
you are on time, you are clearly signalling that you will regard it as her fault if things don't start on time. Do you act this belligerently with business colleagues?
I am surprised that you don't get something far more curt like "bog off, wait until I'm good and ready" in response.