Vodacom contract

My husband struggle since May 2020 to cancel my vodacom contract that expired in April. We went into the vodacom shop and they told us to phone the call centre which we did. A week later a salesperson from vodacom contact us and ask us if we want to upgrade. My husband told the lady that we asked them to cancel the contract. The lady said she cannot pick up anything on there system but she will help us to cancel it. 3 weeks ago my husband spoke to a male who also said he cannot pick up anything from the system but he will get into the recording system to investigate and find out who we spoke to. Until now he did not get back to us. Sunday the 27th we went into the vodacom store and the sales lady phone vodacom from her private cellphone. My husband spoke to a female again and he told her the whole story. She said to my husband this is not her problem we must pay first and then she can see what she can do!!! After an argument she promised to call back.........Until now NOTHING!!!!!!!