Unable to use data on cellphone. Vodacom cant assist

<p>I recently upgraded my contract. Since the upgrade my phone cannot surf the web, cant download photos on whatsapp and cannot download images on facebook. No app that uses internet can work. Vodacom told me to do a sim swap. When inserting a sim card from a different carrier the data works. Calling customer services does not work as they tell you to go tona store or the hang up on you. Dont know what to do anymore. Pointless having a "smart phone" and cannot use it.</p>