Charmboard Deep Learning and Computer Vision Engineer interview questions

I was interviewed for Deep Learning and Computer Vision Engineer role. The process was one telephonic round with HR, one technical round with senior engineer, and final round with the CEO. I had cleared all the round but didn't get the offer letters from them. HR took my current company offer letter and payslip and promise to give me an offer letter in the coming weeks. But never got one. Every time I asked for an update, she said to update me in the coming weeks and she went on silent mode. I had the worst interview experience where even after qualifying all the rounds you didn't get proper updates. The company has an unprofessional HR and hiring process. And applying to this compan was totalyl waste of timeu