You are entitled for incentive which previous company has denied,if 110% achievement ,depending on what the target for incentive was.
If they write to your company, a feeling can come in the mindset of your current employer,that you are legal minded(though fully justified from your POV)
All depends on how much is the amount they have denied you.
If you really feel so strongly about the matter,write to the labour commissioner or send a legal notice,depending on whether you are covered by Shops and Establishment Act.
12th July 2015 From India, Pune