Just been looking into this and from the little info I can find, it looks like your phone number would be classed as personal information and so covered by the data protection act.
Yeah. Just submitted a form as well and got response from ICO that case work has been received. According to the law, companies that break Data Protection, can be fined up to £500,000 per case.
Technically the organisation in breach would receive a penalty, not a fine. I realise that's a bit pedantic but there is a difference (fines can usually only be made and enforced by the courts).
The ICO can also prosecute the company and officers in the criminal courts under some situations, including: "unlawfully obtaining, disclosing, or procuring the disclosure of personal data;" (I don't know whether this would count as unlawful disclosure or not).