Amazon MlLHS associate-is it scam

Hi folks, recently got selected for Amazon mlhs role for a contract of 12 months but I'm not sure whether it is legit job....I was told my joining date was in 2nd September and my onboarding and background verification were already completed...now suddenly hr mailed that my joining date postponed to 30th September!!!! I got no clue...I even had received the IT equipment....they did not contact through any mail nor the manager informed anything...out of the blue hr is saying my bgv is pending where I can clearly see all are complete in their portal....even send mail to them with screenshot but no reply.....seeking help ....as been liad off since 7 months already so desperately need this job