Fuse block melted down

So my fuse block on top of my battery melted to the the point that there was a quarter size hole in the plastic box that sits on top of the battery. Weeks later AC stopped working, compressor was not coming on at all. Took it to shop. Compressor still under warranty but to determine if it was the part they had to fix my fuse block. Fix fuse block, replace compressor. AC still not fixed, it is the condenser coils (hope that is right). Decide to pick up car rather than put more into it. Go to pick up car and car will not start. They looked at it and said think it was computer as it was not giving them any readings except one time it said bad fuel pump. Only one time. They order a computer now they cannot get the computer programmed to my car. The car is only worth maybe $800.00 running. Do you have any insight as to what the problem may be or do I just need to pick up my car and sell to someone for parts (after all it has a new fuse block, AC compressor, cooling fan which I had replaced earlier in the summer)? I am at a loss.