Ask HN: My Gemini bill shot up suddenly to 2500 USD in one day

our usage of gemini is very limited. using 2.5 flash or similar models. at a hackathon in bay area i used the api key in my google app script. from that day my usage overshot to insane amounts.Google started charging y card every 30 mins or so. Google support said they will help significantly waive this off but they havent been swift. any one else experienced anything similar?