Old iTunes Match library won't go away
This is a totally bizarre situation, but here goes.
I subscribed to iTunes Match probably the year it was first offered (2008?). Paid for it for a couple of years then decided it was really more than I needed, so I cancelled.
I *ASSUMED* that cancelling would zap the copies of my music from Apple servers, but over the years, I have seed bits and pieces of music getting duplicated on my devices (Mac and iPhone) that appeared to have come from Match.
This week, watching network stats on my iPhone, I discovered almost exactly the same amount of data in my music library (~21gb) get uploaded to "somewhere". Totally freaked me out, because I could only think of someone hacking my iPhone and getting a copy of everything.
My real question here is "If I cancelled my iTunes Match 10-12 years ago but think it's still syncing with my devices, how can I turn it off?". Guessing Apple Support would get confused about this real quick.
Any ideas?
iPhone 12