Debited for a contract that expired a year ago

I have previously canceled my contract with Telkom. My contact expired more than a year ago. I went to the branch on numerous accessions at Vaal mall, and was advised that they do not cancel contracts. I have been receiving calls from agents that i qualify for an upgrade. All i wanted was to cancel their services. Today I am debited R322 for a service that im not using. I want my money back