Beware Viacom Online Upgrade

My wife upgraded one of our cellphone contracts online, using the "upgrade" function on Vodacom's app. They've sent her the phone ordered, but now claim that it was a new contract ordered, not an upgrade. Upon querying this, she was told to "look at the fine print". The person she dealt with is struggling to comprehend her explanation that she upgraded a number and at no point in time requested a new contract. It clearly states on the invoice sent with the phone, that it was an upgrade. All it would take is a few minutes of effort from Vodacom's side to check their invoice sent and rectify the issue, but they have no interest in doing so. I'd advise anyone wanting to use the upgrade service on Vodacom's app to rather desist from doing so until they've rectified this issue with their app. This isn't going to happen until they acknowledge that they do in fact have a problem, which they're too lazy/*********** to check up on at present.