Need advice on flip and sell.

[Chershauna Dorsey]

I purchased a 2unit building to flip and sell June 2021. Since purchasing I am only 30% done with the rehab project. I have not had a good experience with the GC or hard money lender. I am at a profit loss so I decided to wholesale  the property as is. I have an interested investor who wants  to take over(all Chicago permits are paid and architectural drawings are paid). Now the GC states that I owe them money for labor. The last draw money given to me was 12k which I forwarded to the GC to complete the next scope of work which is not completed. The GC gives me the invoice which includes all labor and materials and that’s it. I send the invoice to the lender and then they quick back the money, I forward to the GC. How can I protect myself from the GC or is this legal? I had no idea how the GC was getting paid. I thought it was from the money that is given from the draw request. Any advice, this is holding up the sell. Thanks