Business ProfileforAntwerpen Volkswagen

I had an appointment on Thurs. Nov 16, 2023 for the dealer install a fin antenna which I brought from a dealer in N. Carolina (where our car broke down). They estimated $592 based on approximately 3 hours of work. The car was finished in 1-1.5 hours - I could see it outside - but they still charged me $592. I discussed it with Service Mgr. Ralph ****** and Mgr. Chris ******.. I told them I would exercise my right to do a consumer inquiry through my credit card company. They became aistated and bullied me by yelling that I was trying to committing fraud. They stapled my key to the bill. and said that I now must pay cash to get the car.. A shuttle driver had to take me to the ATM for cash. My husband wrote a negative review on Google and CarFax, which they acknowledged and promised that "Corporate" would respond to me, but I have heard nothing. Then 1 week later, the antenna stopped working. When I called for an appointment to have them make it right, Ralph ****** said that I had to pay a "diagnostic fee" of about $200. Clearly, a repair should last longer that a week, yet they want the consumer to pay to have it fixed! This dealership has been dishonest, low quality, and downright rude. I would like them to stand behind their work and fix my car without further cost, insults, or aggravation. Can you please advise me about that recourse I have with Antwerpen Volkswagen? Thank you.