Vodacom activates an additional contract instead of doing an upgrade to an existing one.

I upgraded my cell phone contract with vodacom online. Then with the next payment they charged me my old contract price and another contract. They had apparently made a mistake and issued a new contract instead of doing the upgrade. Now they say the only way to fix this is by collected my device again. I've already had the device for a month and have downloaded all my apps and have purchased a screen protector and cover for this device. Why must they collect the device in order to fix their mistake on the system??? This is ridiculous. Can someone please help me here because their call centre insists the device must be collected. Alternatively, they might as well collect this device and end both these contracts because Vodacom won't inconvenience me again.