Best answer by Shivsy
I worked out in the end that I had actually set up two SoundCloud accounts without realising. When I logged in through my FB details it took me to one of the accounts. When I logged in using my Gmail account it had set up a second account, I had no idea it was creating a brand one! I thought it was the same one every time.
When I sussed this out, and logged into my original one, all the payment transactions were listed and the option to cancel my subscription was easy to do.
Hope this might shed some light on what is happening with yours