Engine Clicking And Tapping Noises problems of the 2007 Mazda MAZDA6

I was drive my fiance car and on my way home I start hearing a ticking noise. When I got home I check the oil and then the next day I got it towed to the Mazda dealership to be check because it was still under warranty. They had the car for a week after the second day I call to see what was going on I talk to the head mechanic his name was patrick he said"I should have no problem because we taking the top part of the motor off and the motor been well taking care of so your warranty will be good. The next day I get a call saying we need oil change record I sent all the record but two cause I had time to do it myself and I never save the receipt cause it was a new car. I get a call three days later talking about my warranty was denied cause of no oil so when I was told that I call the dealership to talk to patrick the head mechanic to find out he was let go. The reason why there is a nice time period in my claim cause I didn't have money for a lawyer but a lady I was talking to from penndot gave me your website.