Water in diesel filled up at Engen Duzi Convenience Centre

I filled up at the Engen Service Station on 24 Aprl 2022. On 25 April, my vehicle's tank sensors picked up water in the separator. I took the car to Mitsubishi for a check up and thry confirmed what the sensors had detected. I went to the service station to report the matter and they denied point blank that, it could be them. They said said their denial was based on machine readings for water levels (which showed zero). Unfortunately, this was a couple of days after I filled up or the incident (as picked up by the dealership).