Very disappointed with the service, we bought an 2...

Very disappointed with the service, we bought an 2018 Chevrolet half ton truck and purchased an additional 3000.00 of coverage to cover any issues with the vehicle. It has been over 20 days since the vehicle was purchased and we have been left going back and forth trying to get the vehicle fixed. The A.C unit was installed improperly and never charged . We noticed this within the first few days and called. The sales and the service group both guaranteed that they would take care of us. So far neither has happened. There has been empty promises and has made with little follow through.