Terrible Service

Last year I ordered an iPad online and I was told it comes with topdog voucher, till today I have not received that voucher. Every time I call them I get sent from pillar to post. What also puzzles me is that the iPad comes with 2Gig data on which we do not use much of it but every time toward month end we run out of data. What worse is that I always try and do updates via Wifi at work and most of the time the Cellular data option is switched off. I have tried to query this but I do not get a proper assistance. I have 5 contracts with Vodacom and on 3 out of the 5 I always receive poor service whenever I enquire about the issues I'm experiencing. I have been a customer of Vodacom since 1996 and right one I am fed up and I'm thinking of cancelling all of my contracts with them because their customer service is terrible.