Decryption Program – RSA Encryption

I have an urgent problem. Some of my company's servers have been hit by SAMAS. I have paid the ransom and got the decrypt application, however the decryption works a little strange, it doesn't put the files exactly as they were. Images have 3-4 strange horizontal lines, docs and excels won’t open. There is an important database that needs to be decrypted as well that runs in SQL. My guess is that the decryption program wasn't written very well, so it doesn't put back the file as it should. I do have the private and the public keys and also the application for decrypting and I will provide them for you to potential reverse engineer. What I need is a simple program in order to decrypt correctly some important files. I do have the original files, I tried just with copies, since the application is rewriting the original (encrypted) files. If you think you can do this please let me know so I can send you the needed files. The encryption was made with RSA Encryption. I don't care about what programming language you use, just make it to run on Windows. If you succeed and at least 50 PDFs and Word/Excel files perfectly decrypted and restored I will consider that you did the perfect job (that the restore is perfect now) and the project will be complete. Just one decrypting program. I already paid for the ransom, so please keep that in mind while quoting. Thank you.