Additional month charged on contract cancellation

Using the Myaccount facility on the Autopage website, I logged a call on the 30th March to have my cellphone contract cancelled with effect 30 April. The request was only acknowledged by an Autoage agent some 7 days later. The contract was only cancelled end of May as a result of the delay and I was charged for an additional month.<br> I phoned the call center and logged another call to have a credit passed for the additonal month. No action was taken. Why should I be charged an additional month if the delay in taking action was due to Autopage staff?<br> To date my Myaccount facility has been terminated and I have no access to log any new requests or view past history.