I usually go to customers services and demand they make an announcement to the relevant driver of the registered vehicle.
Doesn't matter if they park badly or fail to display a blue badge.
At our local Sainsburys a few years ago the girl on CS said she couldn't do that as it was an outside company who managed the car parking.
I said, "In that case can you contact Steve please and ask him to come down and see me?"
She asked who Steve was. I said "Steve XXXX, he happens to be your branch manager and I'm sure he will tell you to make the announcement."
She asked, "Do you know him then."
"Yes", I replied, "in fact here he comes now."
She picked up the microphone and quickly made the announcement.
I wouldn't have known Steve from Adam except his picture and name were displayed on the wall behind her!