Un happy client

We trade an isuzu in we got less money then we axpected after the deal went throug the sales men told me that the last exact isuzu he sold ...sell for a lot more and he think he will buy this one .... we then chose a car we test drive it all went well and smooth we took the car no problemes after about 20 days the car used oil it looks like thay put in stop smoke in the motor that wil cost us on the end more money to fix the probleme