HCLTech Front End Developer interview questions

I applied through naukri.com then got a call from HR normal discussion about my profile in my current company then Technical round on telephone profile was for front end developer but interviewer was more interested in python and sql,

Overall the Technical interview process is good. But HR is very bad. Once after the HR discussion over, i was informed that i will get offer letter within 10days. But not its almost a month over, and i didnot recevied an offer letter. Also HR is not responding for my calls and email. I feel this is very bad behaviour in MNC like this.