Charged twice per month

[user-removed]

I've been q subscriber to Spotify for a while now, and I've noticed that I've been charged twice a month since September, maybe earlier.
I've narrowed it down to the time I changed the payment date of my phone bill. I used to pay my **bleep** on the 21st of every month, but changed it to the 1st for convenience. But the Spotify payments continued to go out on both dates. Is there anything you can do about this? Because in certain I only have 1 account linked through my Facebook and no other account had been made through my debit card.