J.P. Morgan Senior Developer interview questions

The first round was telephonic interview. Got a call at the scheduled time, the interviewer was having good interviewing skills he asked me good questions on architectural concepts. Eg REST vs what? if you have to pic other better options. Some other internals of concurrent hash map and linked hash map. I was expecting the feedback to be positive as I gave right answers but seems like they were looking for some more skills which i was not having and mentioned in the resume already what all i have as my skills. But i would mark the interview as negative because after the interview i waited for 3 weeks and called atleast twice in a week to get the feedback there was no reply from HR ,once he picked and said need to wait for response. And then after 2 weeks when i called again he searched in his mail and said the feedback was negative but he forgot to drop me a mail. I mean you do not expect the HR to be so irresponsible of such a big organization.

Interview process started on time, technically strong, all real time questions. But I rejected offer due to the below story. "Worst Ever cheat on the day of offer"... I am a 13 Year experienced . I had called for an interview with JPMC Bangalore, It went well. And HR called me for Salary negotiation and she come up with the number(25% hike ) which is less below my expectation and communicated the same, After a Week she called me again and come up with the number(30%) which was mid of my expectation and above the previous number. We had mutually agreed the number and I confirmed my joining. Then she had told me that she will rollout the offer in three days. I was awaiting for their mail/call. On the third day she called me and said higher management didn't agree to rollout with 30% and they had given only 10% hike. I was surpring ,you had come up with the number without being approved by higer management ?. is it on your own number ?. Does recruitment Hr have the ability to ask the higer management how can you roll out some number and the day of offer you had reduce the number which is been communicated to "so called interviewed person ". Dont we have some respect to the experienced person before you had rollout the number for the mutual agreement ?. How it make the belive in JPMC... I can suggest who ever go for on interview, Please ask for the salary negotiation and what they can pay you max before you waste couple of HRS with JPMC and being cheated like this.