Upgrade vodacom contract, instead getting a brand new contract together with old contract

I recently upgraded my vodacom contract through the vodacom website, by logging in with my user details, to view my current account, i was able to upgrade my contract, as it was due for an upgrade. Everything went fine, i received my new phone, all happy. Even had to pay an upgrade fee, which i didnt mind doing. But then i noticed I had another Vodacom account on my name, so instead of upgrading my current contract, they created a new contract, so now i've got two contracts that I need to pay, even tho an upgrade fee did deduct in my bank account.

Dont think they can easily resolve their ****up either, instead now I have to send back the phone I got, and cancel the new contract, only then would I be able to reapply for the upgrade again, and you bet your sweet ass they'll charge me again. Only once i've upgraded AGAIN will they send me back the phone/new phone.

I mean honestly I used your website to upgrade my own contract in my own account, no where never ever did it say that i'm applying for a totally new contract, hence the upgrade fee I already paid. They just dont give a **** to sort this out properly either.