SoftwareSerial won't work at 115200 baud. 38400 is the best it can do I believe.
If you can't change the Bluetooth baud rate then maybe you could connect the Bluetooth device to pins 0 and 1 and use a USB-TTL cable connected to the SoftwareSerial pins to communicate with the PC at 9600 baud.
Or use an Ardduino Mega which has 3 spare HardwareSerial ports.
...R
PS. please post your program using the code button </> so it looks like this. See How to use the Forum. It makes it much easier for people to help you