bad after sales service

I accepted a Data Bundle package contract from Mondeo ( in association with Vodacom) which was approved on 19 November 2015. I am still trying to get this data activated on the number *** and every time I call , I get a message \ due to unforseen circumstances the call centre is unavailable". WHAT is the point of having a Data Contract if you can't use it !!!!! I think I would like to cancel this contract before it begins ! I am sure I legally still have time to do so. The After Sales Service is disgusting"""