Billing and general customer services

Telkom mobile in SA has the most *********** complaints and call centre customer care services ever. I logged a complaint with them earlier last month and they said they had opened a case that would be handed to someone in billing to call me back within 3 days and have the issue resolved within 7 days. I called them after 3 days had gone by only to find the agent hadn't opened the case and the whole thing had to be re done. I then waited 3 days again nobody contacted me and this happened twice after the matter had been escalated by call centre manager. I then called them every 2nd day after that and all i have had is promises that manager would call me 15mins later. This happened e days in a row. I just wrote this complaint being put on hold by their agent for the 2nd time while they try get a manager. They're service is terrible