SERVICE COMPLAINT / TERRIBLE CUSTOMER SERVICE

After servicing my car in December my car started driving abnormally.When the fuel hit 100k's the car began violently jerking which was something I'd never experienced in my car.The problem only got worse as the full got lower.My car was taken in twice by a friend as I was traveling only to be told nothing was wrong and then that its normal for this to happen.Upon my return I went to Kia myself.The lady at the front desk was not only rude about the situation but was extremely unhelpful.Not once did I receive an apology instead she argued that she acknowledged this was an inconvenience.She then stated that I'm calling her a **** and she directed me to speak Selim (manager).It was terrible customer service and sincerely expected more from Kia and its employees.I do also find it unacceptable that this is how my car will be forever and nothing can be done about it. It can not be right for any company to release a car that starts jerking and this is deemed \normal\". If this is a ploy to get me to upgrade it is not appreciated as I do not like feeling manipulated to do something I was already planning on doing. So my problem remains and I don't feel safe or a valued customer.I'm appalled"