Cancellation of my services

Cancellation of my services has been a nightmare, after using their network for 3 years without any default on my side. I called them early November as I was going to move out from my current place and was no longer in need of their services. Then all of sudden I didn't have network, yes it was showing but couldn't work on all our devices. I then called them to find out what was going on, and I was informed that vumatel already cancelled my network immediately, without serving me 1 month notice as agreed. I'm very disappointed as now they want me to pay again after paying for something I never used for the month of November. I really want my money which I paid for November without network.