The interviewer was 15 minutes late, cold and had poor interview technique. I was offered the job but I declined - I would not want to work with this person.

Sure, here's a revised version of your text: During my initial phone interview with HR, there were issues with the connection and the call kept breaking up. I kindly mentioned to the interviewer the connectivity issues, and she became agitated and treated me with a negative attitude, replaying everything twice. Regrettably, given her unprofessional behavior, I stated that I wished to discontinue the interview. I didn't want to continue speaking with someone who treated me poorly and was causing frustration due to the connectivity issues.