how to deal with those teammates just taking your credits

Feel very very sad. Don't know what to do. Please help!

I posted my story here a while ago. My story is this:
I worked in a small group (manager A -indian) in a pharmaceutical company. My manager did very bad job. So the company laid him off, but let him stay for another half yr, now only one more month left.

I was assigned as a project biostatistican for a project at the beginning of the yr. teammember B-another inidan was assigned as a leading programmer in this project. While I was doing all the statistical parts, I was also creating all the templates for Tables and Listings. I noticed B did not do his sas codes (Since this is my first project, I did not know who should be responsible for the sas codes for the Tables). I then created all the codes. Once I was done, at the time to present to top levels, my manager A asked B to do the show case. B nataurally took all the codes from me, and later claimed his ownerships on them. According to his statement, I am only the development of the codes. He is the final production of the codes. But, this is not the end of the story. Gradually, my manager A moved all the statistical parts to teammember C. C tried to show contributions on the project, and wrote an amendment of what I did, which is a long long report-- copy entire paragraph from mine, and then revised just one sentence in that paragraph--really only wording. Besides, there are two statistics parts got changed:
1) one is technically wrong done by C. I talked with C. C insists its's right. So far, nobody noticed the mistake yet.
2) another one is that one advance analysis is deleted, which was proposed on the orginal protocol. C simply deleted it--of course with A's permission. This is questioned recently by top level why it was not done. For this, C begged me a wk again not to against her in future meetings once it is questioned again. Meantime, A called me back to this project, and assigned me to finish this left part. (Since from May till two wks ago, I was completely kicked out from this project. The company holds celebration on the success of the project. I was not invited.A, B and C used all my works to take all the credits.On the contrary, A few months ago, when A, B, C had problems, A simply called me in, and started to blame me till one day, I could not take anymore, and fight back with A....) Overall, I did all the jobs for this project. But, nobody (outside of my group) knows I did it.

Ironically,I am doing another project now,repeating exactly the same story... I really do not want B and C take any more advantage from me again. Today, B suddenly found out I created all the sas codes. He asked me to post them to the public area as developer---which implies he'll use all my codes acting as a production programmer. I tried to use some excuses to reject B: codes are not ready, many mistakes, I'll post them later... But B said this area is for development, mistakes are allowed. Noboday can change the codes...Obvious, He wants to take my codes asap--shameless!!!. What shall I do in this situation? ...Shall I go to ask top level to clarify the job assignments? such as: as biostatistician, what job I am supposed to finish; as programmers, what they should do?

Our new manager is also coming 2 wks later. My manager A right now try to be nice to everyone.


Many Many thanks!! sorry my chinese typing iv very very bad...