Failed to deliver for my paid services

Vodacom is so irritating and worthless really. I am contract consistent client for almost 20 years but the service from Vodacom is worse. I am shamed to be a Vodacom client. I paid for my contract but I have not received my airtime. I am on Flexi 510 but not airtime this month. I checked my airtime on Friday the 1st August until Sunday afternoon. I decided call the call centre on Sunday and I couldn't be provided with reason. Lucrecia Tracy promised to call me back once she referred to her team leader on Monday. I trust her because she even apologising for my inconvenience. She never called me as she had promised and I had to call Vodacom again on Monday afternoon. I spoke to consultant but she dropped my call when she was retrieving my enquiry details. She never called me back even though she had all my information as were already done with the security questions. I have to phone Vodacom yet again for their competence . I still don't have my airtime since the 1st of August. Vodacom has contravened our contract.