Salesforce Support Engineer interview questions

There were two one technical round followed by Managerial round. My interview experience was horrible there is no punctuality ,they won't join on time and they will inform about interview just one or two hours before the interview this is not at all good .Even though if I cleared all rounds got a call from hr about proposed offer but they have not release any official letter since three weeks .This is entirely a time waste process for candidate didn't expect this from salesforce. On top of that they need immediate joiners but they won't release offer letter.