IBM Software Developer interview questions

Did several phone interviews and went into a panel interview. All is good with verbal assurance of offer as well as written assurance on LinkedIn and email. Offer never came. Interview process was nearly 3 months. Unreliable Recruiting poc and no communication from hiring manager. Really frustrated at the whole process. If you choose not to hire let me know instead of dragging the process over several months. I have asked repeatedly whether the offer is based on contract award. Was initially told it wasn't. But now no response. So I have basically given up.