HI

i am an international, studying in malaysia. wen i was in malaysia i was using the P1 broadband internet. however, i have already left malaysia for holidays since two months, and i am not using the internet services. but P1 is making me to pay my bills even though of not using it.
they said if i dont pay, they will blacklisted me etc etc

my question is, how serious is it if i get blacklisted for not paying the bills? will i be able to enter malaysia again? (because i have to come back to continue my degree)
will they arrest me or smthng?