I would also not accept the offer and will drag the case to court. This way, the case will be fully investigated.
This is going to cost a lot of money but if it's worth it, you'll just have to prepare the spending through your own pocket.
But once the court decides and you have won the case, everything is going to be a memory on how you've won this huge battle.
It's not easy to go on against these companies for they have a lot of money, and bribing is common from these type of businesses.