It's not, because there's no real receipt confirmation.

They ended up chasing me for 3 years over 20 euros when I moved to the UK. At least here in Sweden, credit checks aren't really a thing thankfully.

Yeah, but try to cancel an internet subscription here in Sweden…

I've always had it included in the BRF or rental agreement. Only 28 Mb/s mind...

You can send a signed letter and that should be legal proof