In the early nineties I worked for a national supermarket which took over a smaller chain, involving massive rewrites of the systems to enable a smooth merger. The smaller chain's employees worked long days and weekends to meet the deadlines, knowing that their jobs would be gone by the time they finished. Consummate professionals - I had enormous respect for their ability and dedication.
I was in the coffee room one day with a senior manager who brushed their work aside. He never offered any bonuses or even thanks to this great team.
Once a company has shown its true colours, there is no benefit in continuing to support it. Get out while you can.