Cancellation of contract

I have called the call center about a few minutes ago regarding the cancellation of my contract as it expires on the 30 April 2015 and I was told by the consultant that I cannot give the 30 day notice as this does not apply to my contract. And that my contract will now be extended by a further month. Accordingly to general rules of all mobile contracts a 30 day notice is given for the cancellation/expiration of a specific contract. By calling in I am giving a 31 day notice regarding the expiration of the contract. I will not consent to a further months subscription as I am within my right to give a 30 days notice which I have just done. I am not prepared to pay any further subscription passed the expiry date of 30 April 2015, according to Part C - Section 14 (3)(1a) of Consumer protection act. Please can someone call me urgently to rectify this.