AWAIT CREDIT NOTE FOR CANCELED CONTRACTS

Upon calling 15 March to cancel 3 of my Vodacom lines i received my bill and still the lines were not cancelled. I lodged a complaint and spoke to the supervisor who said he would investigate and lodge a credit to me however this was the 18 April and still nobody afforded me the courtesy of a follow up. Vodacom are quick to try sell you something but no quick to resolve queries. I want a credit!