MAC Address Spoofing

hiii everyone :D i got a MAC address by spoofing and somehow managed to crack his password for the isp ....

now i am able to login eventhough i dont pay for the internet !!!!

now the isp assigned a different ip address to me ...

What happens when the real owner log in to his account ^^

i have been using some MAC address to get free internet for sometime.

i have another doubt ..... if we use someone else's MAC address will their internet speed decreases or will it divides among the both of us ?

thnx :)