What made it more complex was that store loyalty cards (CVS in our case) caused her to get associated with our new number years later. Retailers sell this info to skip trace people and collectors.
We didn't realize it until we received a mailing addresses from CVS a year ago to a familiar name -- the debtor. Around the time we got really weird calls from bottom of the barrel collectors who buy debt about to age out for less than a penny on the dollar, re-animate it by "making contact" and then reselling it for more money.
3rd party debt collectors know just how easily they can be sued, so while they do push the envelope, if you demonstrate that you understand the laws, they'll back off quickly.
That said, I've found a quick and easy solution for avoiding them: don't buy shit you can't afford, and if you do fall in that trap, negotiate your way out. You can't expect to rack up a huge bill and be surprised you're being held to it.
And the trap is made of punitive fees with high rates of interest that soon make any initial borrowing a trivial part of the sum owed.
Anyone who thinks this can't happen to them is being naive. It can literally happen to anyone, including people who are currently independently wealthy millionaires.
All it takes is a major economic downturn and/or some bad investment choices.
The newest version of the FICO credit score[1] does differentiate between medical and non-medical debts, though, where previous ones did not, and it weights the former less severely.
If you're making $100k a year, living in a nice 4 bedroom house, driving late model cars, and not saving, that is a relatively easy fix.
If you're making $10 an hour working retail, there just isn't enough money to pay for cost of living and any kind of substantial savings.
People in this situation (who make up a huge chunk of America), are one expensive car repair away from disaster and debt collectors.
Now, obviously you don't want to get into this situation in the first place, if you can help it. But if a person is, then they are not simply doomed as you're saying.
We should not excuse exploitation of people living paycheck-to-paycheck simply on the basis that they're bound to get fucked over eventually so it doesn't matter when or how it happens.
I had to start blacklisting phone numbers by the dozens to get any peace. I'm always hearing someone asking for someone I've never heard of and even if you manage to tell a human that you've never heard of that person and that this is your phone number and the person they want will never, ever be here, the debt (and your number) will just get passed to the next batch of collectors and the cycle will continue ever onward.
I can't count how many random bogus legal threats and whatnot I've gotten for someone who I don't know.