How to decrypt after ransomeware infection

Hi, my name is David. I was attacked by a ransomeware created by gandcrap 5.2 and it changed all my files. it added the extension .dotmap.jcdakp.dotmap to all my files and also added a jcdakp.txt file to all my files which contained instruction to go to the dark web and pay so that they give me the decryption keys. 
However, I was able to use Stopdecrypter software and it now creates a copy or decrypts the files so that now the extension becomes .dotmap.jcdakp and then the last .dotmap extension is removed. 
 
If I run the stopdecryter on the new extension, nothing happens. but I am guessing if you can help me with something to decrypt the jcdakp extension, then maybe i run the stopdecryter to get rid of the .dotmap extension. 
 
Hoping you may be of help.