Advice: Unexpected Happy Ending Offer

TLDR: The unexpected happy ending offering halfway through my massage ruined the relaxation of the massage. This is both a PSA about German massage places and a call for advice on what to do to let others know about this one place.

I (M 33) live with my wife in Munich (Americans). I like supporting local businesses, and for Christmas I gave my wife a gift card to the closest massage place so we could both go in one day. It opened We booked two 1-hour massages, went in together on a Sunday, and were taken into separate rooms.

I stripped down to underwear to start, and the masseuse (F) massaged my back while I was face down. The massage was... fine. (I've only had two other massages in my life, and I'm always wanting more pressure. Whatever - this was more for the story.) 30 minutes in, she asks me to flip over, then touched my briefs and said something I didn't understand. She touched my penis through my underwear, made a hand job gesture and whispered "30 Euro." I was dumbfounded. I didn't want to be too stern or flip out because I still had a half hour I paid for, so I told her "not today, but that's good to know" and that I didn't have the cash. She kept asking and pushing, and I tell her, "No, I came in with my wife, I'm married, I'm not doing this."

We eventually continued the massage with no happy ending. She massaged my legs and face (mostly the bridge of my nose, oddly). She frequently sighed looking at the clock a lot while I stifled laughter and anger at the whole ordeal. I was very tense and uncomfortable for the last 20 minutes.

My wife and I laughed about it the whole way home but we were simultaneously ticked for our own reasons. She got no such offer btw.

So, shame on me for not pinning this place as a certain type of massage parlor maybe. What would you do? I would have wanted to know. Is there something I can post to Google maps or elsewhere that could give the public an idea of what to expect?