Bad Customer Service

I have lost my phone and been using Vodacom number for the past 5 years . I have been trying to block my number for the past two days without any success , Tobi cant help you and I have tried to communicate with Vodacom via SMS and still no luck . They keep promising to call me to resolve the matter but every time they call no one communicates and you can. I am quite disappointed and shocked at the services levels from such a big company . They claim to have invested in technology and its failing miserably , they are the most expensive service provider and yet they have the most shocking service ever