Do you not have "star-six-nine" where you can find out the number of your last incoming call?

I agree, contact the company to whom you owe the money, explain the situation, and try to work something out with them if you still can.

I'm sure that lady gets hung up on by other people on purpose, which is why she was so quick to be angry at you, even though you didn't mean it! I've had freind who did that kind of job, and while some people were perfectly nice to them, others swore at them, slammed the phone down on them, and did worse ... not a job I'd want, but one guy in particular was doing it as a second job to help pay off HIS college debts!