Scientific Games QA Engineer interview questions

Interview process was average. 1st Round was technical , the interview asked question related to data structure, and asked few puzzles. 2nd round was techno-managerial round . He asked questions related to database and asked about my role in previous company. After completing these two rounds:- HR round was conducted and in the first call have discussed about the CTC and same was discussed afterwords. After clearing all the 3 round, they told me "congratulation you're selected". Afterwards, they haven't called. Didn't have single discussion. More than a weeks went, still no response, no offer letter nothing. Conclusion:- Before giving an interview ask the HR first, whether they're sure to provide you the employment or taking your interview for consuming your time.