Invoice Due - 75K +, How can I get money back

XXX--pays--> MyVendor--pays--> (me)I--pay--> Several MySub-

vendors

[GA] [NY] [NJ -One

MySUbvendor that breached my contract]

The different layers in my business are as above.

1) One of MySub-vendors breached my contract and started directly

dealing with XXX.

2) My services to MyVendor continued past the breach date, by one of

my sub-vendors.

3) I have paid all MySub-vendors on time

4) After the breach by one of MySub-vendors, MyVendor stopped

paying me for the services. Initially I thought the payments are being

delayed

5) My services to MyVendor continued past the breach by one of my

sub-vendors.

6) MyVendor owes me USD 75thousand plus.

I don't have money to hire a lawyer. How can I get the money? Any

ideas?