At the moment, I think you need to get an opinion from a real developer who can look at the code and the project design to see how long it would take to get it to the prototype stage. Depending on that I would try to get more funding in order to implement it while at the same time pursuing the legal route and trying to get your money back.
Also, learning Django may seem a little overwhelming at first but it's not too difficult - you can usually find the answers to any questions online.