Sonus Networks Software Developer interview questions

I had my worst experience here. I cleared the first round of online test and was called for the interview at 1:15 pm. Nothing seemed to be organized. My interview started at 4 pm. I cleared three rounds of technical interview and was called for the HR interview. At that time,I told the HR that i have another job offer(which I had to confirm by wednesday( This interview took place on monday) and I would reject that if I got this. The HR said that he would be sending me the offer letter on friday and joining would be following wednesday. I didn't receive my offer letter and hence I called them and emailed them to no avail. I headed to the office and the HR said that I wasn't selected. However upon his word that I had got the job during the interview, I had rejected the offer from the other company as well,which was in fact paying a lakh more. They did not behave with integrity and it's a setback on my career.