Northstar Ford will not be getting my 50k. I went...

Northstar Ford will not be getting my 50k. I went in to drive and buy a vehicle that was on the their website. I told the salesman about the vehicle that I wanted to test drive and he asked if his manager could drive my trade-in. Of course I said yes. The salesman could not find the keys for the new vehicle, then he told me that it was not in stock, so he pulled up a different vehicle to test drive. The manager was driving my car while this was happening. When I test drove the alternate vehicle, I found the vehicle that I wanted to buy. It was in stock. We drove back to the office to get the keys and he left me in the parking lot to wait. After 5 minutes I got frustrated and walked out. When I drove away I noticed my check engine light was on and my OBD plug was broken. It appears the manager was tampering with my check engine light (to get a lower price on my trade-in ?) and he broke my OBD plug while doing it. It appears that Northstar Ford is not above dealer fraud. I was an easy sale. I was ready to buy, but Northstar Ford will not be getting my 50K because they act like predators.