My port in exchange was stuck,,what it means?

hi i had a problem with my dsl ,, i have black zxdsl 831ii modem,,

the dsl light was on but internet was off,,

config were ok and refreshed,,

there was no connectivity,,no net,, i had no ip in the device config web page,, there it said in statius ready to connect but it wont connect,,

in detail status it said ppp down..

the exchange people said ur port is hanged,, it took them 5 days to solve thius issue only after a dozen or so calls to them and the exchange ,,

i am asking it because i daily have this issue,, normally in the morning i am not able to use net and have same symptoms,,

thanks

happened with me 2 times