Don't get me started on XM. Starting the second year after I bought a car they were calling me several times a week. It took a few years of "No" and blocking any number in my area code that isn't in my contacts (my phone number is not local) for it to stop.
Then I brought my car to the dealership to have some recall handled, and the calls have started again....
That sounds like it would primarily impact the low-paid worker on the other end of the line rather than alter company policy.
Instead I suggest playing back a pre-recorded sales pitch for a relevant trade union: The workers won’t suffer from bleeding ears and the bosses might actually care.