Capgemini Engineering Software Engineer interview questions

Aricent scheduled my interview on phone, It was first round and 1 hour, after that the called for second round and it also took around 45 mints and i was selected then the called for managerial round on same day but manager behave was not good, they treat like we don't know and she knows every things very poor mentality but i was confident again selected. Again they send me for client interview in Erricson perungundi and their also i selected. Next day HR told me you are selected and now i am preparing our offer letter, I waited two days then after i called HR for what about my offer letter still i have not received offer but she gave some excuse she gave, I called so many time but always she gave excuse, It's very bad experience in Aricent,Guys be care the HR for Aricent.