SiriusXM is the worst. My subscription came with the car, but luckily it wasn't auto-renewed. However, after my subscription expires, I got calls every single day from SiriusXM trying to get me to subscribe again. And each time, they used a different number. It was ridiculous.
In the end, I just pick up the call, and put the phone in my pocket. They still insisted on calling for about half a year before giving up.
This is the one instance where I absolutely abuse the 'customer service' reps that call.
I had a similar thing with a previous car purchase -- Sirius would not get the hint that I had already canceled and didn't want to renew. At one point I stopped being nice and started being malicious. The calls quickly stopped after that. Amusingly, when I canceled siriusxm on the car I bought after, they never called once. I do so hope that means there's a note somewhere attached to my name that says "don't call."
In the end, I just pick up the call, and put the phone in my pocket. They still insisted on calling for about half a year before giving up.