General Dynamics Mission Systems User Experience interview questions

Once every 5 weeks tries to schedule a phone-round! Cancels a scheduled in person round and promises to reschedule. Never communicates again for several weeks. When I ask, HR replies back after a week and promises to reschedule again and then with in minutes sends in rejection letter! The HR/recruiter from the company is the worst professional I have met in years! During the process in progress ( ~ 3 months), her language in emails is extremely derogatory and unprofessional. When pointed out her language and in-sensitivity she takes a step back! However, she never schedules the in-person round! This is the strangest and most rude interview experience I have ever had!