Bad after sales suport

Took fiat palio a year ago for repairs. I told different stories. Ultimately they become honest with me that they dont find the problem. I must come and get the car.its sad for me bcause its agents and they have expects.what makes situation worse the want to charge me for wrong troubleshooting they performed on the car. What im i going to do with that car if agents cant get it right..🤔🤔