There are a lot of details left out of this question, and it seems most of the answers are by people who misunderstand the guidelines. I used to be employed by a towing company - my dad owned the business, and during that I have a reasonably strong knowledge of the legalities of towing automobiles. So, does the towing companies required to inform the police?
You will discover two legal circumstance under which a towing company can enter your premises to tow your vehicle. An example may be the Reposession situation, where you’re behind on the automobile loan repayments and the lending company directs a Repo Man out to pick up your car. The other is if the Police believe there is something illegal going on, and that to rectify the illegality the car must be towed.
The “being made to pay a fine” part of the question can mean one of two things. First, if the Police assert something illegal was happening, there might be a “fine” to pay because of that violation. Secondly, the towing company is going to charge a fee for towing the car and for storing it in their facility. It’s possible some people are puzzled thinking the towing company fee is a fine, when it’s simply a charge billed by the towing company. Finally, I understand that in some towns the towing business is owned by the city, and therefore the tow and storage fee is paid to the city and might be presented as a “fine”.
The “what to do” depends a lot on the specifics that were left out of the question.
For example if there was a legitimate Police enforcement action, then you have to deal with that.
On the other hand, if the specifics are that something happened which is outside those legal circumstances - for example the towing company did not have Police permission for legal enforcement - that’s a whole other situation. That’s where you might go to the Police to explain that the towing company has stolen your car.
Towing companies can be involved in legitimately towing safety a car without direct permission of the car owner. For example car owner going to a concert or sports event sometimes get desperate to find parking and park illegally. In such cases the Police will tow all parking violators in the area. This happens on the say-so of the police and it is perfectly legal.
But as a practical matter - the only real difference between that and an illegal tow is the police officer standing up there giving permission. Tow truck individuals certainly learn how to illegally tow away an automobile. It’s certainly possible some are behaving unscrupulously and do so.