Realtor.com Data Analyst Data Science Experimentation interview questions

The entire process took 6 months for a 3 set of interviews. The HR co-ordinators reply back weeks after an interview. 2 months after giving the final rounds, they contacted me saying they would like to extend an offer. 3 weeks since that call, no offer, calls, texts, emails ignored. Tried contacting multiple people, no correspondence or replies from anyone