Were there a few days ago. We were waved in a park...

Were there a few days ago. We were waved in a parking garage because an event took place. We had no opportunity to turn around. Did not think anything bad (of course, we wanted to benefit from the cheap parking and use the train). When we came back in the evening then the shock: had to pay the full price. Have durchwirklindelt there and they thought that had been on a sign. Have not seen a sign anywhere. No reaction to emails. Thanks for nothing. Never again