Fairfield's Kia

Found the vehicle I wanted online, test drove it, and mentioned the studded snow tires are illegal to drive on outside of winter months in Massachusetts and also that the brakes were pulsating. Salesperson promised new tires and brakes would be fixed. Went to pick up the car and it had the new tires, had been somewhat cleaned and buffed, and we drove the car home. They said they misplaced one of the keys and they would send it to me when they found it. They never found it and told me I would have to pay for a new one because its a used vehicle, even though they had 2 when I agreed to purchase it. After a few weeks of driving, the brakes began pulsing terribly. I contacted service to see what they had done and they said there was no brake work done on the car. Reached out to the salesperson and general manager, but only got an email back from the GM asking for my phone number (which is on file there...) so I emailed him my number and have yet to hear from him. Customer service here is so awful and its discouraging to think I'm going to have to put hundreds of dollars into a car I just purchased because they didn't follow through with what they promised and are not responding to me.