No communication

I sent an email stating that I do not want my contract that will conclude at the end of this month to continue next month. Although I received an automatic reply acknowledging my email, nobody has since given me any feedback for the past 3 days. I tried phoning the call center and already wasted about R300 worth of airtime on the 2 attempts made (I won't be calling again as this is just wasting my money) I don't understand how they expect that a service agreement can proceed if the client cannot get hold of the service provider. I was willing to discuss a possible extension, but just want this cancelled now.