Most security experts will advise against paying the ransom
demands of the malware writers because doing so only helps to finance their criminal enterprise and keep them in business. One of the reasons that folks get infected is because someone before them paid the bad guys to decrypt their data. The more people that pay the ransom, the more cyber-criminals are encouraged to keep creating ransomware for financial gain. Further, there is no guarantee
that paying the ransom will actually result in the restoration (decryption) of your files.
Grinler (aka Lawrence Abrams), the site owner of Bleeping Computer has said this
...Though the loss of your data and computer can be devastating, sending the ransom could be even more so. Depending on how the criminals want you to pay the ransom could put you at risk for Identity Theft as the information you send may contain personal information. Therefore, we suggest that you never pay a ransom unless it is absolutely necessary for data recovery...Last, but not least, it is important to remember that paying the ransom only continues to fuel the release of new variants of these types of programs.
Some ransomware victims have reported they paid the ransom and were successful in decrypting their data. Some victims reported they paid the ransom but the cyber-criminals did not provide a decryptor or a key to decrypt the files, while others reported the key and decryption software they received did not work or resulted in errors. Still others have reported paying the ransom only to discover the criminals wanted more money or threatened to expose data unless additional payment was made. Most cyber-criminals provide instructions in the ransom note that allow their victims to submit one or two limited size files for free decryption as proof they can decrypt the files. However, decryption in bulk may not always work properly or work at all. In some cases victims may actually be dealing with scam ransomware
where the malware writers have no intention or capability of decrypting files after the ransom is paid
Keep all this in mind if you are considering paying the ransom since there is never a guarantee decryption will be successful
or that the decrypter provided by the cyber-criminals will work as they claim...and using a faulty or incorrect decryptor may damage or corrupt the files even further. The criminals may even send you something containing more malware...so why should you trust anything provided by those who infected you in the first place.