Trying to cantact Spotify by all means possible in the hope of a response.

Both me and my wife have a free spotify account and have never attempted to upgrade to the premium service and therfore have never given any back details. However looking back at our joint account I have noticed 4 withdrawals of £9.99 in June through to September of last year. But then stopped after that. I assume this is either a mistake or an act of fraud. I would like to know how I go about getting the money refunded. The bank is aware and has put a block on spotify uk but have told me I need to contct Spotify's fraud team. They gave me a number to be helpful however it doent seem to be for spotify (08000921223). Can you help?