Rude Agent and unprofessional

My line has been hardlocked because of an outstanding bill from last month that i have already paid as arranged, i cannot make or receive calls and my work is being impacted due to this. I spoke to a very rude agent earlier on today and demanded to speak to the team lead, she rudely said someone will call me back and no one has called since, I don’t even know how they will call me since i cannot receive any calls and have no alternative number.