Live at the same spot and parked in the same spot ...

Live at the same spot and parked in the same spot for over five years now. Got a sticker and a business card glued to my windshield. I called the business card stating I was a resident and that I could not remove the sticker. The employee I called responded I was doing my job thats not my problem. A few days later after having my car professionally cleaned the stickers and glue would not come off. I called there office and not only again was told it wasn't there problem but was told by the gentlemen on the phone on a threatening manor that " I'd love to run into you on the property" clearly a threat. I've never in my life delt a more ignorant and unprofessional company. DO NOT HIRE THIS COMPANY!!!