Open Road Mazda of East Brunswick

A few months ago I went to this dealer to help my friend get his new Mazda6. They totally messed up everything. The sales manager is extremely rude and ignorant. After we made a deal on the price, they kept on changing the details. At first they told us we get this car for this price. Then he started to tell us we need to finance at least $2000, then after a few minutes he told us to finance $7000. Then he said the interests rate was 2.9%, then raised to 5.9%, at last when we walked into the finance room with the finance lady it jumped to 9.9%. They play tricks on us. At one point we were unhappy with they kept on changing deals, so the sales manager walked to our table and asked in a very unprofessional and rude manner, "ok guys what is the problem?". Also, the finance lady can not do simple math problems, we end up correct her errors at least three times. Now my friend had the car for four months, he paid off everything and the dealership was suppose to send him the title, but no title after called and visited the dealership numerous times.