Try cancelling contract

Wanted to cancel a cell phone contract that had expired, called ***, gave them all the information they requested. Was told to call *** to cancel. Called ***, requested cancellation on cell phone contract, was told to call ***, told person on phone that I had just called *** and was told to call ***. This went on calling both numbers with no assistance from anyone. Surely Vodacom trains staff who answers calls. I would like the COO to try cancel a contract and see for himself what difficulty customers go through. This is very frustrating for a big company as Vodacom.