It depends on the language of the contract. Does the contract specify who you are to receive payment from? If so, you probably cannot pay yourself from the sales proceeds coming from the vendors.
Without reading the contract and knowing much more about the dispute, it is simply not possible to advise you. Your strategy, however, sets you up to be the defendant on a claim, rather than the plaintiff. I would be cautious here.
If the amount in question warrants the expense and if I were you, I would pay for a consultation with an experienced commercial attorney before embarking on your proposed course of action.
You should obtain legal counsel before deciding on self-help tactics. If you cannot afford one, most law schools have legal clinics that may be able to read through the contract and advise you.
This is my opinion and should not be construed as legal advise for your specific case as there are many more facts which you have not provided.