Waiting for My Offer Letter: How Should I Handle HR's Delay and Excuses?

I have given an interview at a company. There were two rounds, and I have cleared both. Consequently, HR asked me to send documents via email. After I sent the documents, I was told that the offer letter would be generated the next day. However, it has been 10 days, and I still have not received the offer letter. I called the concerned HR official, and they informed me that the offer letter could not be generated due to some technical difficulties.

Understandably, I am very worried. What should I do in these circumstances? Are they liable to generate and send me an offer letter?

I smell something foul on the deal because the plea of the HR department is more smoky. You should talk one more time with HR and ask the reason for the delay and the expected time. Do not be too aspirant over the matter in discussion; you will understand well. You are advised to look for alternatives or consider anything that is online.