A store can ban you for any, or no reason, at long as it isn't illegal discrimination based on race, age, gender, etc. So, you have no case.

No. No you cannot. At least not and win.

If this free service is not sufficient for your needs it may be best to retain a local attorney.

Sounds like a perfectly (and legal) response by the school.

The tags on the car do not figure into the equation............

Lawyers here will not reach out to you. You need to initiate contact.

Undoubtedly a scam. Block the number.............

Just block the number. Not a legal issue............

If you own a house or store you can ban who you want, as long as it not based on race, age, gender, etc.

Seriously? This is not a legal issue. Don't make it one.