There are many reasons for spoofing a MAC Address and its very easy as limited to few commands.
To spoof MAC Address on Kali linux you will first make set your interface so for this type
airmon-ng start wlan0now monitor interface is set to mon0 but to spoof we have to down wlan0 for a while so type
ifconfig wlan0 downnow wlan0 is down and now we will spoof the mac address by typing one simple command which is below and replace the mac address with MAC in the command i.e in my case the client has F0:CB:A1:2A:FB:62 so i will type " ifconfig wlan0 he ether F0:CB:A1:2A:FB:62
ifconfig wlan0 hw ether MAC
Once you have did this you will have to turn the wlan0 so for this purpose type
ifconfig wlan0 up
now you have sucessfully spoofed your desired mac address