
Sometimes, after a merger the new company needs to reduce its workforce to realise the efficiencies gained through the merger. I have seen where some [poor] management use the annoyance to "encourage" staff to seek other employment opportunities as its lower cost than making positions redundant. However, in my experience, this approach nearly always backfires as its the best staff members that are most re-employable and they end up losing the ones they really needed to keep.
Either that or is just laziness, ignorance or incompetence from the management.
I truly hope this is not what is happening in your situation.
I have been through mergers/acquisitions/outsourcing many times, averaging one every 5 years in my working career, and I have found that the bigger the companies involved, the better they handle such situations, with dedicated teams of people working hard to ensure proper integration and comfort through the process. From an employee perspective, my most recent "move" (earlier this year) has been the smoothest and best handled, and it involves several hundred staff in Australia and over a thousand globally. Lots of new processes to learn, and associated hick-ups, but the support from senior management on both sides has been outstanding with true sponsorship and intent to overcome the challenges and not just sweep them under the carpet.