Now its months notice period!!!!

I phoned your call center about a month ago wanting to cancel die data package supp**** by you. Was told the cancellation would be immediate. Fine so we wait. Today we phoned no months notice is required. Were you just lying because you want to or are your call center agents so misinformed. Now I have to continue this contract until 30 April 2015 - and the contact has expired on 10 MARCH 2015!!!! Just get it right - get your information straight so that the customer gets the same service and answers all the time not just depending on the day and who you speak to!!!!! Disappointing service, lack of correct information - UNACCEPTABLE!! Would like feedback regarding this ASAP