HR having no clue no requirements ,Earlier they are ok with 2 month notice and once you clear all rounds they ll ask you to join early or no offer .
Wasted 1 month , their process itself takes 1 month for all interview and then once you clear they become Ghost , No body will respond to your emails or calls
Please respect Candidates time and should have requirements pretty clear on Day 1 when you need a candidate and on what budget.