What, do they want us to fill it out multiple times? Is it from different companies? Do they have any clue what they want? The answer to all of these questions remains unknown.
that's making a huge assumption: that your number only appears once in the list. That's not how databases work. They could have collated 20 lists together, and your number appears more than once in the list and now their are duplicate records. Perhaps they have
different names on each record but the same phone number, such as a separate record for every housemate, and for everyone else who had that phone number before you. They may also have alternate ways the names were written (al smith, al, allan smith, allan david smith, could all be in there, but with the same phone number).
If you ask one call-center worker to remove your number, they will only remove the database record that's right in front of them, but that doesn't to jack shit to remove your number from any other records that exist. If you don't respond: that database record just goes back at the end of the queue to receive the next round of calls.
Also remember this whole process is entirely automated. It rings forever because there's a machine dialling the numbers, and it only hooks you to an available human if/once you pick up. If you never pick up, the machine doesn't get
tired it just goes "beep beep no answer, back on the queue with you". It's also not smart enough to realize multiple files have the same phone number and it shouldn't be ringing them over and over. It's only smart enough to say for
this particular file we called it on day X, so it shouldn't try again for, say 2 days.