Die besten Restaurants mit Biergarten Essen in Planegg

Very bizarre experience when paying with an EC card. The waitress wanted my phone number or email address because the EC device only required a signature instead of a PIN and the boss wanted it that way if my account wasn't funded. I'm sorry, what ?! Apart from the fact that I am of course not obliged to do so, I find such an announcement or demand to be absolutely outrageous.