The
Grumbletext website might be able to help you.
I sympathise with your situation. These reverse-charged premium short codes rely on the sender honouring any request not to send any further messages. This is totally unacceptable as it allows unscrupulous organisations to dip into the credit of victims. It's a disgrace that mobile providers allow this and don't simply bar any incoming messages where it has been requested that they stop sending them.
Whois ubercool-eu.com (that's a look-up of registration information for that internet address):
Quote:domain: ubercool-eu.com
created: 15-Jun-2010
last-changed: 28-Jun-2010
registration-expiration: 15-Jun-2011
nserver: ns67.1and1.co.uk
nserver: ns68.1and1.co.uk
status: CLIENT-TRANSFER-PROHIBITED
registrant-firstname: Nick
registrant-lastname: Shave
registrant-street1: Vibration Enterprises Ltd Station B
registrant-street2: Copthall Bridge House
registrant-pcode: HG1 1SP
registrant-state: NYK
registrant-city: Harrogate
registrant-ccode: GB
registrant-phone: +44.7733267401
registrant-email: nick {dot} shave {at} cellular-x {dot} com
…
So it's less than three months since it was registered and it's only been registered for one year. Not sure whether Nick Shave is his real name! There's a mobile number there